Initial push

Author: thinknathan

.gitattributes

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+# Auto detect text files and perform LF normalization
+* text=auto
+
+# Exclude files from archive
+.gitattributes export-ignore

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Dependency directories
+node_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Images
+*.jpg
+*.jpeg
+*.png
+*.bmp
+*.tiff
+*.gif

README.md

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+# node-image-slice
+
+Command-line utility that slices an input image into segments according to specified width and height, and outputs those segments into a folder.
+
+## Usage
+
+`node slice.cjs <filename> <width> [height]`
+
+- If `filename` does not include an extension, `.png` will be guessed
+- If `height` is not specified, `width` will be used as `height`
+
+## Supported formats
+
+- jpeg
+- png
+- bmp
+- tiff
+- gif
+
+## Background
+
+Created with Chat-GPT 3.5.

package.json

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+{
+  "name": "node-image-slice",
+  "version": "1.0.0",
+  "description": "Slices an input image into segments according to specified width and height",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/thinknathan/node-image-slice.git"
+  },
+  "author": "Nathan Bolton (https://thinknathan.ca/)",
+  "license": "CC0-1.0",
+  "type": "commonjs",
+  "main": "slice.cjs",
+  "files": [
+    "slice.cjs"
+  ],
+  "scripts": {
+    "prettier": "prettier \"./**/*.{cjs,md,json}\" --write"
+  },
+  "devDependencies": {
+    "jimp": "~0.22.10",
+    "prettier": "^3.1.1"
+  }
+}

slice.cjs

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+#!/usr/bin/env node
+
+const Jimp = require("jimp");
+const fs = require("fs");
+const path = require("path"); // Import the 'path' module for working with file paths
+
+const outputFolder = "output";
+
+function sliceImage(filename, width, height) {
+  Jimp.read(filename, (err, image) => {
+    if (err) {
+      // Try again by appending '.png' to the filename
+      const pngFilename = `${filename}.png`;
+      Jimp.read(pngFilename, (pngErr, pngImage) => {
+        if (pngErr) {
+          console.error("Error reading the image:", pngErr);
+          return;
+        }
+        continueSlicing(pngImage, width, height, filename);
+      });
+    } else {
+      continueSlicing(image, width, height, filename);
+    }
+  });
+}
+
+function continueSlicing(image, width, height, inputFilename) {
+  // If height is not specified, use width as height
+  height = height || width;
+
+  const imageWidth = image.getWidth();
+  const imageHeight = image.getHeight();
+
+  // Calculate the number of slices in both dimensions
+  const horizontalSlices = Math.ceil(imageWidth / width);
+  const verticalSlices = Math.ceil(imageHeight / height);
+
+  // Create a folder for output if it doesn't exist
+  if (!fs.existsSync(outputFolder)) {
+    fs.mkdirSync(outputFolder);
+  }
+
+  // Slice the image and save each segment
+  for (let y = 0; y < verticalSlices; y++) {
+    for (let x = 0; x < horizontalSlices; x++) {
+      const startX = x * width;
+      const startY = y * height;
+
+      const sliceWidth = Math.min(width, imageWidth - startX);
+      const sliceHeight = Math.min(height, imageHeight - startY);
+
+      const slice = image.clone().crop(startX, startY, sliceWidth, sliceHeight);
+
+      // Incorporate the input filename into the output filename
+      const baseFilename = path.basename(
+        inputFilename,
+        path.extname(inputFilename),
+      );
+      const outputFilename = `${outputFolder}/${baseFilename}_${x}_${y}.png`;
+
+      slice.write(outputFilename);
+      console.log(`Slice saved: ${outputFilename}`);
+    }
+  }
+}
+
+// Get input from the command line arguments
+const [filename, width, height] = process.argv.slice(2);
+
+if (!filename || !width) {
+  console.log("Usage: node sliceImage.js <filename> <width> [height]");
+} else {
+  sliceImage(filename, parseInt(width), parseInt(height));
+}