xavierpinho / image-dithering-demo

Image dithering library and tool

image-dithering-demo

This repository contains straightforward implementations of various well-known image dithering algorithms for my own educational purposes.

Algorithms

• Greyscale (ITU-R BT.601-7, ITU-R BT.709-6 and average)
• Threshold (fixed and random)
• Ordered (2x2, 4x4 and 8x8)
• Floyd-Steinberg
• Jarvis-Judice-Ninke
• Stucki
• Burkes
• Sierra, Sierra lite and 2-row Sierra
• Atkinson

Quick start

cd src && make
cd ../eg && make

The commands above build and populate the eg directory with the resulting images obtained from dithering the file kodim23.png.

The resulting images are in NetPBM's P1/P2/P3 file formats.

Building

Run make inside the src directory. The source code is in ANSI C but requires libpng.

Using

Once built run the cli executable found inside the src directory. You may run cli without parameters to get help.

License

Public domain (see the UNLICENSE file.)

Credits

The test image kodim23.png is copied from http://r0k.us/graphics/kodak/.