eLxr packages [ bianca ]
[ 原始碼： didder ]
套件：didder（1.3.0-1 以及其他的）
Extensive, fast, and accurate command-line image dithering tool
didder is an extensive, fast, and accurate command-line image dithering tool. It is designed to work well for both power users as well as pipeline scripting. It is backed by the author's dithering library (https://github.com/makew0rld/dither), and is unique in its correctness and variety of dithering algorithms. It provides many options, while being correct (linearizing the image, weighting channels by luminance).
Types of dithering supported
* Random noise (in grayscale and RGB) * Ordered Dithering * Bayer matrix of any size (as long as dimensions are powers of two) * Clustered-dot - many different preprogrammed matrices * Some unusual horizontal or vertical line matrices * Yours? You can provide your own ordered dithering matrix in JSON format * Error diffusion dithering * Simple 2D * Floyd-Steinberg, False Floyd-Steinberg * Jarvis-Judice-Ninke * Atkinson * Stucki * Burkes * Sierra/Sierra3, Sierra2, Sierra2-4A/Sierra-Lite * Steven Pigeon (https://hbfs.wordpress.com/2013/12/31/dithering/) * Yours? You can provide your own error diffusion matrix in JSON format
Features
* Set palette using RGB tuples, hex codes, number 0-255 (grayscale), or SVG color names (https://www.w3.org/TR/SVG11/types.html#ColorKeywords) * Optionally recolor image with a different palette after dithering * Set dithering strength * Image is automatically converted to grayscale if palette is grayscale * Force image to grayscale with --grayscale * Change image saturation, brightness, or contrast before dithering * Read EXIF rotation tags by default (disabled with --no-exif-rotation) * Downscale image before dithering, keeping aspect ratio * Upscale image after dithering, without producing artifacts * Supports input image of types JPEG, GIF (static), PNG, BMP, TIFF * Output to PNG or GIF * Process multiple images with one command * Combine multiple images into an animated GIF * Uses all CPU cores when possible * Support images with transparency (alpha channel is kept the same)