Show HN: Ordered dithering command-line tool
A developer shared a command-line tool called "dither" on Hacker News that applies ordered dithering to images. The tool processes images and reduces their color palette using a threshold matrix to create a halftone-like effect directly from the terminal.
Background
- Ordered dithering is a classic image-processing technique (dating to the 1970s) that reduces an image's color palette while preserving the illusion of depth or shading by arranging pixels in a fixed, repeating pattern (a "Bayer matrix"). It's what gave early computer graphics, game sprites, and printed materials their distinctive grainy, crosshatched look.
- This Show HN post presents a new command-line tool written in Rust that lets users apply ordered dithering to images from the terminal. Rust is a systems programming language valued for its performance and memory safety.
- The tool is a practical example of retro/constrained-aesthetic image processing — relevant to pixel art, game development, demoscene projects, or anyone wanting to give modern images an old-school, low-bit-depth appearance. Being a CLI tool makes it scriptable and suitable for batch processing or integration into larger pipelines.