minor corrections

Author: coduri

docs/index.md

@@ -27,7 +27,7 @@ Below is an overview of the project's architecture:
 
 ### Key Components
 - **`index.html`**: The main frontend interface where users select algorithms, perform operations, and upload images.
-- **`app.py`**: A Flask-based web server providing API endpoints for frontend interactions (see [API Reference](api_reference.md) for details).
+- **`app.py`**: A Flask-based web server providing API endpoints for frontend interactions (see [API Reference](pages/api_reference.md) for details).
 - **`algo_interface.py`**: An interface to access various visual secret sharing schemes. It maintains a dictionary that maps scheme names to their respective functions.
 - **`scripts/`**: Contains the core implementations of visual cryptography and random grid schemes.
       - `visual_cryptography/`: Contains different Visual Cryptography implementations.

scripts/random_grid/rg_grayscale_additive_SS.py

@@ -33,7 +33,7 @@ def get_requirements():
 # Returns a dictionary containing the description and reference links for the algorithm.
 def get_description():
     return {
-        "text": "This (2,2) Visual Secret Sharing Scheme is a straightforward additive VSS scheme that handles grayscale images.",
+        "text": "This (2,2) Visual Secret Sharing Scheme extends the general additive secret sharing scheme to handle grayscale images.",
         "links": [
             {"text": "Kafri & Keren",
              "url": "https://doi.org/10.1364/ol.12.000377"}
@@ -52,8 +52,7 @@ def create_random_grid(size):
     Returns:
     numpy.ndarray: A grid filled with random integer values between 0 and 255.
     """
-    grid = np.array([[secrets.randbelow(256) for _ in range(size[1])] for _ in range(size[0])], dtype=np.uint8)
-    return grid
+    return np.array([[secrets.randbelow(256) for _ in range(size[1])] for _ in range(size[0])], dtype=np.uint8)
 
 
 # Function to create a difference grid by subtracting the image from the random grid
@@ -66,10 +65,9 @@ def create_difference_grid(image, grid):
     grid (numpy.ndarray): The random grid (as a numpy array) to be transformed by subtraction.
 
     Returns:
-    numpy.ndarray: A grid where each value is the result of subtracting the corresponding image value from the grid.
+    numpy.ndarray: A grid where each value is the result of subtracting the corresponding grid value from the image.
     """
-    transformed_grid = grid - image
-    return transformed_grid
+    return image - grid
 
 
 # Function to overlay two grids by performing subtraction
@@ -82,12 +80,12 @@ def decrypt(image1, image2):
     image2 (PIL.Image.Image): The second image (PIL Image object), to be converted to numpy array and processed.
 
     Returns:
-    PIL.Image.Image: The resulting image (PIL Image object) after subtracting the second grid from the first.
+    PIL.Image.Image: The resulting image (PIL Image object) after adding the two grids.
     """
     img1_array = np.array(image1.convert('L'))  # Convert PIL Image to numpy array (grayscale)
     img2_array = np.array(image2.convert('L'))  # Convert PIL Image to numpy array (grayscale)
 
-    overlaid_image = img1_array - img2_array
+    overlaid_image = img1_array + img2_array
     return Image.fromarray(overlaid_image.astype(np.uint8))  # Convert numpy array back to PIL Image
 
 

scripts/visual_cryptography/vc_color_cmyk.py

@@ -5,7 +5,7 @@
 # Returns a dictionary containing function mappings and metadata for the algorithm (used by the web interface).
 def get_config():
     return {
-        "name": "VC - Color CMYK",
+        "name": "VC - Color (CMYK) Halftone",
         "description": get_description(),
         "requirements": get_requirements(),
         "encrypt": encrypt,