Image Processing (BMP)

Small C console program that loads 8-bit and 24-bit BMP images, applies common filters, and performs histogram equalization for contrast correction. Everything runs via interactive prompts in the terminal.

Features

• 8-bit BMP workflow: open/save, print image metadata, filters (negative, brightness, threshold to B/W, box blur, Gaussian blur, sharpen, outline, emboss), histogram equalization.
• 24-bit BMP workflow: open/save, filters (negative, grayscale, brightness, box blur, Gaussian blur, sharpen, outline, emboss), histogram equalization on luminance (YUV) to keep colors consistent.
• Uses simple convolution kernels for blur/sharpen/edge/emboss effects.
• Sample assets included: barbara_gray.bmp (8-bit) and flowers_color.bmp (24-bit).

Build

Requires a C compiler and CMake (tested with C11).

mkdir -p build
cd build
cmake ..
cmake --build .
./CProject

The CProject executable is defined in CMakeLists.txt and links main.c, bmp8/, bmp24/, and histogram/.

Usage

The executable runs in an interactive loop:

1. Choose image format: 1 for 8-bit grayscale BMP, 2 for 24-bit color BMP.
2. Use menu options to open an image (provide a BMP path), apply filters, run histogram equalization, and save the result to a new path.
3. 8-bit only: you can also print basic image info from the header.

Filters:

• 8-bit: negative, brightness (integer delta), threshold to B/W, box blur, Gaussian blur, sharpen, outline, emboss.
• 24-bit: negative, grayscale, brightness, box blur, Gaussian blur, sharpen, outline, emboss.
• Histogram equalization: option 5 in the 8-bit menu, option 4 in the 24-bit menu.

Notes and limitations

• Only uncompressed BMP files are supported (8-bit indexed or 24-bit true color).
• Paths are read from stdin; ensure they exist before loading and that the output path is writable.
• Image buffers are kept in memory; large images may increase memory use.