kindle-lockscreen-creator/index.html at main · sykesgabri/kindle-lockscreen-creator · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Kindle Lockscreen Creator</title>

  <!-- Google Fonts -->
  <link rel="preconnect" href="https://fonts.googleapis.com">
  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
  <link href="https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Roboto:ital,wght@0,100..900;1,100..900&display=swap" rel="stylesheet">

  <!-- FontAwesome Icons -->
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">

  <style>
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: "Roboto", sans-serif;
      background: linear-gradient(to bottom right, #1e1e2e, #181825, #11111b);
      color: #cdd6f4;
      min-height: 100vh;
      padding: 2rem;
    }

    .bebas-neue {
      font-family: "Bebas Neue", sans-serif;
      font-weight: 400;
      font-style: normal;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
    }

    .header {
      text-align: center;
      margin-bottom: 2rem;
    }

    .header h1 {
      font-size: 3rem;
      font-weight: bold;
      margin-bottom: 0.5rem;
      background: linear-gradient(to right, #89b4fa, #cba6f7);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .header p {
      color: #bac2de;
    }

    .section-card {
      background-color: #313244;
      border: 1px solid #45475a;
      border-radius: 0.5rem;
      padding: 1.5rem;
      margin-bottom: 2rem;
    }

    .section-title {
      font-size: 1.5rem;
      margin-bottom: 1rem;
    }

    .collapsible-header {
      width: 100%;
      padding: 1rem 1.5rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: transparent;
      border: none;
      border-radius: 0.5rem;
      color: inherit;
      cursor: pointer;
      transition: background-color 0.2s;
    }

    .collapsible-header:hover {
      background-color: #45475a;
      border-radius: 0.5rem;
    }

    .collapsible-header.active {
      background-color: #45475a;
      border-radius: 0.5rem;
    }

    .collapsible-title {
      display: flex;
      align-items: center;
      gap: 0.75rem;
    }

    .collapsible-content {
      display: none;
      padding: 0 1.5rem 1.5rem;
    }

    .collapsible-content.active {
      display: block;
    }

    .alert-box {
      border-radius: 0.5rem;
      padding: 1rem;
      margin-bottom: 1.5rem;
      border: 1px solid;
    }

    .alert-warning {
      background-color: #3e2a1f;
      border-color: #fab387;
      color: #f9e2af;
    }

    .alert-danger {
      background-color: #3a1f28;
      border-color: #f38ba8;
      color: #eba0ac;
    }

    .alert-info {
      background-color: #1f2d3a;
      border-color: #89b4fa;
      color: #89dceb;
    }

    .alert-title {
      display: flex;
      align-items: flex-start;
      gap: 0.5rem;
      font-weight: 600;
      margin-bottom: 0.5rem;
    }

    .alert-title svg {
      flex-shrink: 0;
      margin-top: 2px;
    }

    .alert-warning .alert-title {
      color: #fab387;
    }

    .alert-danger .alert-title {
      color: #f38ba8;
    }

    .alert-info .alert-title {
      color: #89b4fa;
    }

    .instruction-step {
      margin-bottom: 1.5rem;
    }

    .instruction-step h3 {
      font-size: 1.25rem;
      color: #cba6f7;
      margin-bottom: 0.5rem;
    }

    .instruction-step ol,
    .instruction-step ul {
      margin-left: 1.5rem;
      line-height: 1.6;
    }

    .instruction-step li {
      margin-bottom: 0.5rem;
    }

    .code-block {
      background-color: #11111b;
      color: #a6e3a1;
      padding: 0.75rem 1rem;
      border-radius: 0.375rem;
      font-family: monospace;
      font-size: 0.75rem;
      margin-top: 0.5rem;
      overflow-x: auto;
    }

    .inline-code {
      background-color: #11111b;
      color: #a6e3a1;
      padding: 0.125rem 0.5rem;
      border-radius: 0.25rem;
      font-family: monospace;
      font-size: 0.875rem;
    }

    .link {
      color: #89b4fa;
      text-decoration: underline;
    }

    .link:hover {
      color: #74c7ec;
    }

    .grid {
      display: grid;
      gap: 2rem;
      margin-bottom: 2rem;
    }

    @media (min-width: 768px) {
      .grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .preview-panel {
        position: sticky;
        top: 2rem;
        align-self: start;
      }
    }

    .upload-button {
      display: block;
      width: 100%;
      text-align: center;
      padding: 0.75rem 1rem;
      border-radius: 0.5rem;
      font-weight: 600;
      background-color: #89b4fa;
      color: #1e1e2e;
      cursor: pointer;
      transition: background-color 0.2s;
      border: none;
      font-size: 1rem;
    }

    .upload-button:hover {
      background-color: #74c7ec;
    }

    .file-input {
      display: none;
    }

    .select-input {
      width: 100%;
      padding: 0.5rem 1rem;
      border-radius: 0.375rem;
      background-color: #45475a;
      border: 1px solid #585b70;
      color: #cdd6f4;
      cursor: pointer;
      font-size: 1rem;
    }

    .radio-option {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      padding: 0.5rem;
      border-radius: 0.375rem;
      cursor: pointer;
      transition: background-color 0.2s;
      margin-bottom: 0.75rem;
    }

    .radio-option:hover {
      background-color: #45475a;
    }

    .radio-option.active {
      background-color: #45475a;
    }

    .radio-option input[type="radio"] {
      width: 1rem;
      height: 1rem;
      accent-color: #89b4fa;
    }

    .radio-label {
      flex: 1;
    }

    .radio-label-title {
      font-weight: 500;
    }

    .radio-label-desc {
      font-size: 0.875rem;
      color: #bac2de;
    }

    .slider-container {
      margin-left: 1.75rem;
      margin-top: 1rem;
      padding: 0.75rem;
      background-color: #45475a;
      border-radius: 0.375rem;
      display: none;
    }

    .slider-container.active {
      display: block;
    }

    .slider-group {
      margin-bottom: 0.75rem;
    }

    .slider-group:last-child {
      margin-bottom: 0;
    }

    .slider-group label {
      font-size: 0.875rem;
      color: #cdd6f4;
      display: block;
      margin-bottom: 0.25rem;
    }

    .slider-group input[type="range"] {
      width: 100%;
      accent-color: #89b4fa;
    }

    .slider-hint {
      font-size: 0.75rem;
      color: #9399b2;
      margin-top: 0.25rem;
      font-style: italic;
    }

    .checkbox-option {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      padding: 0.5rem;
      border-radius: 0.375rem;
      cursor: pointer;
      transition: background-color 0.2s;
      margin-bottom: 1rem;
    }

    .checkbox-option:hover {
      background-color: #45475a;
    }

    .checkbox-option input[type="checkbox"] {
      width: 1rem;
      height: 1rem;
      accent-color: #89b4fa;
      border-radius: 0.25rem;
    }

    .filename-input-group {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      margin-bottom: 0.5rem;
    }

    .filename-input-group span {
      color: #bac2de;
    }

    .filename-input-group input {
      width: 5rem;
      padding: 0.5rem 0.75rem;
      background-color: #45475a;
      border: 1px solid #585b70;
      border-radius: 0.375rem;
      color: #cdd6f4;
      text-align: center;
      font-family: monospace;
    }

    .info-text {
      font-size: 0.875rem;
      color: #bac2de;
      margin-bottom: 0.5rem;
    }

    .info-icon-text {
      display: flex;
      align-items: flex-start;
      gap: 0.5rem;
      font-size: 0.75rem;
      margin-bottom: 0.5rem;
    }

    .info-icon-text svg {
      flex-shrink: 0;
      margin-top: 2px;
    }

    .info-icon-text.warning {
      color: #fab387;
    }

    .info-icon-text.purple {
      color: #cba6f7;
    }

    .download-button {
      width: 100%;
      font-weight: 600;
      padding: 1rem 1.5rem;
      border-radius: 0.5rem;
      background: linear-gradient(to right, #89b4fa, #cba6f7);
      color: #1e1e2e;
      border: none;
      cursor: pointer;
      font-size: 1rem;
      transition: all 0.2s;
    }

    .download-button:hover {
      background: linear-gradient(to right, #74c7ec, #b4befe);
      transform: scale(1.05);
    }

    .preview-placeholder {
      aspect-ratio: 1072/1448;
      background-color: #1e1e2e;
      border: 2px dashed #585b70;
      border-radius: 0.375rem;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #6c7086;
    }

    .preview-container {
      background-color: #1e1e2e;
      padding: 1rem;
      border-radius: 0.375rem;
      display: inline-block;
    }

    .preview-canvas {
      border: 1px solid #585b70;
      border-radius: 0.375rem;
      display: block;
    }

    .preview-info {
      font-size: 0.875rem;
      color: #bac2de;
      line-height: 1.5;
    }

    .preview-info p {
      margin-bottom: 0.25rem;
    }

    .hidden {
      display: none !important;
    }

    .contributor-section {
      margin-top: 3rem;
    }

    .contributor-header {
      display: flex;
      align-items: flex-start;
      gap: 0.75rem;
      margin-bottom: 1rem;
    }

    .contributor-header svg {
      flex-shrink: 0;
      margin-top: 2px;
    }

    .contributor-content p {
      font-size: 0.875rem;
      line-height: 1.6;
      margin-bottom: 0.75rem;
    }

    /* FontAwesome icon sizing */
    .alert-title i {
      font-size: 20px;
    }

    .info-icon-text i {
      font-size: 16px;
    }

    .collapsible-title i {
      font-size: 24px;
    }

    #instructions-icon {
      font-size: 24px;
    }
  </style>
</head>
<body>
  <div class="container">
    <!-- Header -->
    <div class="header">
      <h1 class="bebas-neue">Kindle Lockscreen Creator</h1>
      <p>Formats images for use as custom Kindle lock screens.</p>
    </div>

    <!-- Installation Instructions -->
    <div class="section-card">
      <button class="collapsible-header" id="instructions-toggle">
        <div class="collapsible-title">
          <i class="fa fa-book" style="color: #89b4fa;"></i>
          <h2 class="bebas-neue section-title" style="color: #89b4fa; margin: 0;">How to install custom lock screens on your Kindle</h2>
        </div>
        <i class="fa fa-chevron-down" id="instructions-icon" style="color: #bac2de;"></i>
      </button>

      <div class="collapsible-content" id="instructions-content">
        <br>
        <!-- Compatibility Warning -->
        <div class="alert-box alert-warning">
          <div class="alert-title">
            <i class="fa fa-exclamation-triangle"></i>
            <span>Important Compatibility Note</span>
          </div>
          <p style="font-size: 0.875rem;">
            This tool currently creates images for the <strong>11th Generation Kindle (2024 Release)</strong> (1072×1448)
            and the <strong>1st Generation Kindle Scribe</strong> (1860×2480). Other Kindle models may require different image
            dimensions/settings and have not yet been tested with images from this app.
          </p>
        </div>

        <!-- Ads Warning -->
        <div class="alert-box alert-danger">
          <div class="alert-title">
            <i class="fa fa-exclamation-circle"></i>
            <span>Critical: Ads Must Be Disabled</span>
          </div>
          <div style="font-size: 0.875rem;">
            <p>Custom lock screen images will <strong>only display when ads are disabled</strong> on your Kindle.</p>
            <p style="font-weight: 600; margin-top: 0.5rem;">If you haven't purchased your Kindle yet:</p>
            <ul style="margin-left: 1.5rem; margin-top: 0.5rem;">
              <li><strong>DO NOT</strong> pay extra for an ad-free Kindle at purchase</li>
              <li>Buy the ad-supported version</li>
              <li>The current jailbreak method for new Kindles (AdBreak) <strong>requires ads to be present</strong> to work</li>
              <li><strong>After jailbreaking</strong>, remove ads from your Kindle</li>
            </ul>
            <p style="font-style: italic; margin-top: 0.5rem;">
              Remember: Jailbreak first (while ads are present), then remove ads.
            </p>
          </div>
        </div>

        <!-- Installation Steps -->
        <div class="instruction-step">
          <h3 class="bebas-neue">Step 1: Jailbreak Your Kindle</h3>
          <p style="font-size: 0.875rem; line-height: 1.6;">
            Before installing custom lock screen images, you must jailbreak your Kindle. Detailed instructions
            for all Kindle models can be found at
            <a href="https://kindlemodding.org" target="_blank" class="link">kindlemodding.org</a>.
          </p>
        </div>

        <div class="instruction-step">
          <h3 class="bebas-neue">Step 2: Install USBNetLite</h3>
          <p style="font-size: 0.875rem; line-height: 1.6;">
            Install USBNetLite through KUAL on your jailbroken Kindle. This enables SSH access to your Kindle's
            root shell. Download it here:
            <a href="https://github.com/notmarek/kindle-usbnetlite" target="_blank" class="link">github.com/notmarek/kindle-usbnetlite</a>
          </p>
        </div>

        <div class="instruction-step">
          <h3 class="bebas-neue">Step 3: Connect to Your Kindle via SSH</h3>
          <ol style="font-size: 0.875rem;">
            <li>Ensure your Kindle is connected to the same local network as your computer</li>
            <li>Open USBNetLite on your Kindle</li>
            <li>Tap "Toggle USBNetwork" to enable SSH</li>
            <li>
              On your computer, open a command prompt or terminal and type:
              <div class="code-block">ssh root@[kindle-local-ip]</div>
              <p style="font-size: 0.75rem; color: #9399b2; margin-top: 0.25rem; margin-left: 1rem;">
                Don't know your Kindle's IP? Use
                <a href="https://angryip.org/" target="_blank" class="link">Angry IP Scanner</a> to find it.
              </p>
            </li>
            <li>
              When prompted for a password, type: <span class="inline-code">kindle</span>, all lowercase
            </li>
            <li>
              You should see a notice about the rootfs being read-only and a prompt like:
              <div class="code-block">[root@kindle us]#</div>
            </li>
          </ol>
        </div>

        <div class="instruction-step">
          <h3 class="bebas-neue">Step 4: Upload Your Custom Images</h3>
          <ol style="font-size: 0.875rem;">
            <li>
              Make the root filesystem writable:
              <div class="code-block">mntroot rw</div>
            </li>
            <li>
              Exit the SSH session:
              <div class="code-block">exit</div>
            </li>
            <li>
              Navigate to the directory where you saved your custom images:
              <div class="code-block">cd /path/to/custom-images</div>
            </li>
            <li>
              Copy all images to your Kindle (this will overwrite the default lock screen images):
              <div class="code-block">scp bg_ss*.png root@[kindle-local-ip]:/usr/share/blanket/screensaver</div>
              <div style="display: flex; align-items: flex-start; gap: 0.5rem; font-size: 0.75rem; color: #cba6f7; margin-top: 0.5rem; margin-left: 1rem;">
                <i class="fa fa-book" style="flex-shrink: 0; margin-top: 2px;"></i>
                <p>
                  <strong>For Kids Mode:</strong> Use <span class="inline-code" style="color: #cba6f7; background-color: #11111b;">bg_kids_ss*.png</span> instead.
                  Kindles in "For Kids" mode use a different set of lock screen images with the "bg_kids_ss" naming convention.
                </p>
              </div>
            </li>
            <li>Reboot your Kindle to see the custom images when you lock the screen</li>
          </ol>
        </div>

        <div class="instruction-step">
          <h3 class="bebas-neue">Step 5: Configure KOReader (If Applicable)</h3>
          <p style="font-size: 0.875rem; line-height: 1.6; margin-bottom: 0.5rem;">
            If you use KOReader, you'll need to point its settings to the stock lock images directory,
            as KOReader overrides default Kindle locking behavior.
          </p>
          <ol style="font-size: 0.875rem;">
            <li>
              Go to <span class="inline-code">Settings → Sleep Screen → Wallpaper</span>
            </li>
            <li>Set it to "Show random image from folder on sleep screen"</li>
            <li>
              Go to "Custom images" and enable "Cycle through images in order" (if you want default Kindle behavior)
            </li>
            <li>
              Tap "Choose random image folder" and navigate to:
              <div class="code-block">/usr/share/blanket/screensaver</div>
            </li>
            <li>Set that folder as the random image folder</li>
            <li>
              Go back to <span class="inline-code">Settings → Sleep Screen → Sleep Screen Message</span>
            </li>
            <li>Disable "Add custom message to sleep screen"</li>
          </ol>
          <p style="font-size: 0.875rem; line-height: 1.6; margin-top: 0.5rem; color: #9399b2;">
            Now locking within KOReader open should display your custom images exactly as the default Kindle UI would.
          </p>
        </div>

        <!-- Restore Info -->
        <div class="alert-box alert-info">
          <h3 class="bebas-neue" style="color: #89b4fa; margin-bottom: 0.5rem;">Restoring Original Images</h3>
          <p style="font-size: 0.875rem;">
            If you want to restore the original lock screen images, you can download them at:
            <a href="https://github.com/sykesgabri/kindle-lockscreen-creator/tree/main/stock-lockscreens" target="_blank" class="link" style="font-family: monospace;">https://github.com/sykesgabri/kindle-lockscreen-creator/tree/main/stock-lockscreens</a>
          </p>
        </div>
      </div>
    </div>

    <!-- Main Grid -->
    <div class="grid">
      <!-- Left Panel - Controls -->
      <div>
        <!-- Upload Section -->
        <div class="section-card">
          <h2 class="bebas-neue section-title" style="color: #89b4fa;">1. Upload Image</h2>
          <input type="file" id="file-input" class="file-input" accept="image/*">
          <label for="file-input" class="upload-button">Choose Image File</label>
        </div>

        <!-- Resolution Selection -->
        <div class="section-card hidden" id="resolution-section">
          <h2 class="bebas-neue section-title" style="color: #89b4fa;">2. Select Kindle Model</h2>
          <select id="resolution-select" class="select-input">
            <option value="11th-gen-2024">11th Gen Kindle (2024 Release) - (1072×1448)</option>
            <option value="1st-gen-scribe">1st Gen Kindle Scribe - (1860×2480)</option>
          </select>
          <p class="info-text" style="margin-top: 0.5rem;">
            Choose your Kindle model for the correct screen resolution
          </p>
        </div>

        <!-- Sizing Method -->
        <div class="section-card hidden" id="sizing-section">
          <h2 class="bebas-neue section-title" style="color: #89b4fa;">3. Choose Sizing Method</h2>

          <div class="radio-option active" data-method="scale-fit">
            <input type="radio" name="sizing-method" value="scale-fit" checked>
            <div class="radio-label">
              <div class="radio-label-title">Scale to Fit</div>
              <div class="radio-label-desc">Maintain aspect ratio, add borders if needed</div>
            </div>
          </div>

          <div class="radio-option" data-method="scale-fill">
            <input type="radio" name="sizing-method" value="scale-fill">
            <div class="radio-label">
              <div class="radio-label-title">Scale to Fill</div>
              <div class="radio-label-desc">Maintain aspect ratio, crop edges if needed</div>
            </div>
          </div>

          <div class="radio-option" data-method="stretch">
            <input type="radio" name="sizing-method" value="stretch">
            <div class="radio-label">
              <div class="radio-label-title">Stretch</div>
              <div class="radio-label-desc">Ignore aspect ratio, fill entire canvas</div>
            </div>
          </div>

          <div class="radio-option" data-method="crop">
            <input type="radio" name="sizing-method" value="crop">
            <div class="radio-label">
              <div class="radio-label-title">Custom Crop</div>
              <div class="radio-label-desc">Adjust crop position manually</div>
            </div>
          </div>

          <div class="slider-container" id="crop-sliders">
            <div class="slider-group">
              <label for="crop-x">Horizontal Position: <span id="crop-x-value">50</span>%</label>
              <input type="range" id="crop-x" min="0" max="100" value="50">
            </div>
            <div class="slider-group">
              <label for="crop-y">Vertical Position: <span id="crop-y-value">50</span>%</label>
              <input type="range" id="crop-y" min="0" max="100" value="50">
            </div>
          </div>
        </div>

        <!-- Level Adjustments Section -->
        <div class="section-card hidden" id="levels-section">
          <h2 class="bebas-neue section-title" style="color: #89b4fa;">4. Level Adjustments (Optional)</h2>

          <div class="alert-box alert-info" style="margin-bottom: 1.5rem;">
            <div class="alert-title">
              <svg width="16" height="16" fill="currentColor" viewBox="0 0 16 16">
                <path d="M8 15A7 7 0 1 1 8 1a7 7 0 0 1 0 14zm0 1A8 8 0 1 0 8 0a8 8 0 0 0 0 16z"/>
                <path d="m8.93 6.588-2.29.287-.082.38.45.083c.294.07.352.176.288.469l-.738 3.468c-.194.897.105 1.319.808 1.319.545 0 1.178-.252 1.465-.598l.088-.416c-.2.176-.492.246-.686.246-.275 0-.375-.193-.304-.533L8.93 6.588zM9 4.5a1 1 0 1 1-2 0 1 1 0 0 1 2 0z"/>
              </svg>
              <span>Why adjust image levels?</span>
            </div>
            <p style="margin-bottom: 0;">
              Kindle e-ink screens have limited contrast and may display some images as too dark, washed out, or lacking detail.
              Use these adjustments to fine-tune the brightness and contrast of your image for optimal display on your Kindle screen.
              Some images work well without adjustments, but darker photos or low-contrast images may benefit from tweaking these settings.
            </p>
          </div>

          <div class="checkbox-option" style="margin-bottom: 1.5rem;">
            <input type="checkbox" id="enable-levels">
            <div class="radio-label">
              <div class="radio-label-title">Enable Level Adjustments</div>
              <div class="radio-label-desc">Adjust black point, white point, and midtones</div>
            </div>
          </div>

          <div class="slider-container" id="level-sliders">
            <div class="slider-group">
              <label for="black-point">Black Point: <span id="black-point-value">0</span></label>
              <input type="range" id="black-point" min="0" max="100" value="0" disabled>
              <div class="slider-hint">Darken shadows →</div>
            </div>

            <div class="slider-group">
              <label for="white-point">White Point: <span id="white-point-value">255</span></label>
              <input type="range" id="white-point" min="155" max="255" value="255" disabled>
              <div class="slider-hint">← Lighten highlights</div>
            </div>

            <div class="slider-group">
              <label for="gamma">Midtones: <span id="gamma-value">1.0</span></label>
              <input type="range" id="gamma" min="50" max="200" value="100" disabled>
              <div class="slider-hint">← Darken | Brighten →</div>
            </div>
          </div>
        </div>

        <!-- File Number -->
        <div class="section-card hidden" id="file-number-section">
          <h2 class="bebas-neue section-title" style="color: #89b4fa;">5. Set File Number</h2>

          <div class="checkbox-option">
            <input type="checkbox" id="kids-mode">
            <div class="radio-label">
              <div class="radio-label-title">Kids Mode</div>
              <div class="radio-label-desc">Enable this if your Kindle is set to "For Kids" mode</div>
            </div>
          </div>

          <div class="filename-input-group">
            <span id="filename-prefix">bg_ss</span>
            <input type="text" id="file-number" maxlength="2" placeholder="XX" value="00">
            <span>.png</span>
          </div>

          <p class="info-text">Enter a two-digit number (00-99)</p>

          <div class="info-icon-text warning">
            <i class="fa fa-info-circle"></i>
            <p>Numbers 00-19 are tested and confirmed working (this is the range the stock set of images uses). Numbers beyond 19 should work but haven't yet been tested.</p>
          </div>

          <div class="info-icon-text purple hidden" id="kids-mode-note">
            <i class="fa fa-book"></i>
            <p>Kids Mode uses a different set of lock screen images with the "bg_kids_ss" prefix</p>
          </div>
        </div>

        <!-- Download Button -->
        <button class="download-button hidden" id="download-button">Download</button>
      </div>

      <!-- Right Panel - Preview -->
      <div class="preview-panel">
        <div class="section-card">
          <h2 class="bebas-neue section-title" style="color: #cba6f7;">Preview</h2>

          <div id="preview-placeholder" class="preview-placeholder">
            <p>Upload an image to see preview</p>
          </div>

          <div id="preview-output" class="hidden">
            <p class="info-text" style="margin-bottom: 0.5rem;" id="preview-dimensions">Final Output (1072×1448, Greyscale)</p>
            <div class="preview-container">
              <canvas id="preview-canvas" class="preview-canvas"></canvas>
            </div>
            <div class="preview-info" style="margin-top: 1rem;">
              <p>• Format: 8-bit Greyscale PNG</p>
              <p id="preview-info-dimensions">• Dimensions: 1072 × 1448 pixels</p>
              <p id="preview-info-model">• Model: 11th Gen Kindle (2024 Release)</p>
            </div>
          </div>
        </div>
      </div>
    </div>

    <!-- Hidden Processing Canvas -->
    <canvas id="processing-canvas" style="display: none;"></canvas>

    <!-- Contributor Section -->
    <div class="section-card contributor-section">
      <div class="contributor-header">
        <i class="fa fa-info-circle" style="color: #cba6f7; font-size: 28px;"></i>
        <div>
          <h2 class="bebas-neue section-title" style="color: #cba6f7; margin-bottom: 0.5rem;">About This Tool</h2>
          <div class="contributor-content">
            <p>
              Full disclosure: This app was <strong>vibe-coded</strong> (I suck at JS so I made an AI write it for me) and so far has only been tested on an
              11th Gen Kindle (2024 Release), as that's what I have. While it should work for the 1st Gen Kindle Scribe based on documented specifications,
              this hasn't yet been verified.<br>
              <br>
              I have still gone over the code and manually tweaked phrasing, and ensured that all instructions are accurate to the best of my ability.
            </p>
            <p>
              <strong>Special thanks to:</strong>
              <br>
              <ul>
                <li>
                  <a href="https://jcs.org/2025/02/24/kindle" target="_blank" class="link">Joshua Stein</a>
                  for the invaluable resource that helped determine where default lock screen images are stored,
                  the correct export settings and naming conventions, and the 1st Gen Kindle Scribe's resolution.
                </li>
                <br>
                <li>
                  <a href="https://kindlemodding.org" target="_blank" class="link">The Kindle modding community</a>
                  for making this possible in the first place, and allowing people to free the hardware they own
                  from Jeff Bezos' clutches.
                </li>
                <br>
                <li>
                  <a href="https://github.com/notmarek" target="_blank" class="link">Marek Veselý</a> for creating
                  USBNetLite for Kindle, among many other great contributions to the Kindle modding community.
                </li>
                <br>
                <li>
                  <a href="https://github.com/angryip/ipscan" target="_blank" class="link">The Angry IP Scanner devs</a>
                  for creating a tool that makes it easy to find out the local IP addresses of devices on your network.
                </li>
                <br>
                <li>
                  <a href="https://github.com/koreader/koreader" target="_blank" class="link">The KOReader devs</a>
                  for creating an incredibly feature-rich E-book reader that's compatible with pretty much everything,
                  and a must-have for jailbroken Kindles.
                </li>
                <br>
                <li>
                  <a href="https://github.com/sykesgabri/kindle-lockscreen-creator" target="_blank" class="link">All contributors to this tool</a> for
                  helping improve the codebase and adding support for other models of Kindle.
                </li>
              </ul>
            </p>
          </div>
        </div>
      </div>

      <div class="alert-box alert-info" style="margin-bottom: 0;">
        <div class="alert-title" style="margin-bottom: 0.5rem;">
          <i class="fa fa-users"></i>
          <h3 class="bebas-neue" style="font-size: 1.25rem;">Contributions Welcome!</h3>
        </div>
        <div style="font-size: 0.875rem;">
          <p>This project needs your help! If you have access to other Kindle models, please contribute by:</p>
          <ul style="margin-left: 1.5rem; margin-top: 0.5rem; margin-bottom: 0.5rem;">
            <li>Testing these generated images on your Kindle model</li>
            <li>Submitting resolution and image specifications for your model</li>
            <li>Sharing the default lock screen images from your Kindle</li>
            <li>Reporting any issues or bugs you encounter</li>
            <li>Suggesting improvements or new features</li>
          </ul>
          <p style="margin-top: 0.75rem;">
            Submit pull requests and issues at:
            <a href="https://github.com/sykesgabri/kindle-lockscreen-creator" target="_blank" class="link" style="font-family: monospace;">https://github.com/sykesgabri/kindle-lockscreen-creator</a>
          </p>
          <p style="font-size: 0.75rem; font-style: italic; margin-top: 0.5rem; color: #74c7ec;">
            Your contributions help make this tool compatible with more Kindle models.
          </p>
        </div>
      </div>
    </div>
  </div>

  <script>
    // State variables
    let uploadedImage = null;
    let sizingMethod = 'scale-fit';
    let resolution = '11th-gen-2024';
    let kidsMode = false;
    let cropPosition = { x: 50, y: 50 };
    let processedImageData = null;
    let levelsEnabled = false;
    let levelAdjustments = { blackPoint: 0, whitePoint: 255, gamma: 1.0 };

    const RESOLUTIONS = {
      '11th-gen-2024': { width: 1072, height: 1448, name: '11th Gen Kindle (2024 Release)' },
      '1st-gen-scribe': { width: 1860, height: 2480, name: '1st Gen Kindle Scribe' }
    };

    // DOM Elements
    const fileInput = document.getElementById('file-input');
    const resolutionSection = document.getElementById('resolution-section');
    const sizingSection = document.getElementById('sizing-section');
    const fileNumberSection = document.getElementById('file-number-section');
    const downloadButton = document.getElementById('download-button');
    const resolutionSelect = document.getElementById('resolution-select');
    const fileNumberInput = document.getElementById('file-number');
    const kidsModeCheckbox = document.getElementById('kids-mode');
    const filenamePrefix = document.getElementById('filename-prefix');
    const kidsModeNote = document.getElementById('kids-mode-note');
    const cropSliders = document.getElementById('crop-sliders');
    const cropXSlider = document.getElementById('crop-x');
    const cropYSlider = document.getElementById('crop-y');
    const cropXValue = document.getElementById('crop-x-value');
    const cropYValue = document.getElementById('crop-y-value');
    const previewPlaceholder = document.getElementById('preview-placeholder');
    const previewOutput = document.getElementById('preview-output');
    const previewCanvas = document.getElementById('preview-canvas');
    const processingCanvas = document.getElementById('processing-canvas');
    const previewDimensions = document.getElementById('preview-dimensions');
    const previewInfoDimensions = document.getElementById('preview-info-dimensions');
    const previewInfoModel = document.getElementById('preview-info-model');
    const instructionsToggle = document.getElementById('instructions-toggle');
    const instructionsContent = document.getElementById('instructions-content');
    const instructionsIcon = document.getElementById('instructions-icon');
    const levelsSection = document.getElementById('levels-section');
    const enableLevelsCheckbox = document.getElementById('enable-levels');
    const levelSliders = document.getElementById('level-sliders');
    const blackPointSlider = document.getElementById('black-point');
    const whitePointSlider = document.getElementById('white-point');
    const gammaSlider = document.getElementById('gamma');
    const blackPointValue = document.getElementById('black-point-value');
    const whitePointValue = document.getElementById('white-point-value');
    const gammaValue = document.getElementById('gamma-value');

    // Instructions collapsible
    instructionsToggle.addEventListener('click', () => {
      const isActive = instructionsContent.classList.contains('active');
      instructionsContent.classList.toggle('active');
      instructionsToggle.classList.toggle('active');

      // Update icon
      if (isActive) {
        instructionsIcon.className = 'fa fa-chevron-down';
      } else {