Simple resampling library in pure Rust.
- No dependencies, minimal abstractions
- No encoders/decoders, meant to be used with some external library
- Tuned for resizing to the same dimensions multiple times: uses preallocated buffers and matrixes
extern crate resize; use resize::Pixel::RGB24; use resize::Type::Lanczos3; // Downscale by 2x. let (w1, h1) = (640, 480); let (w2, h2) = (320, 240); // Don't forget to fill `src` with image data (RGB24). let src = vec![0;w1*h1*3]; // Destination buffer. Must be mutable. let mut dst = vec![0;w2*h2*3]; // Create reusable instance. let mut resizer = resize::new(w1, h1, w2, h2, RGB24, Lanczos3); // Do resize without heap allocations. // Might be executed multiple times for different `src` or `dst`. resizer.resize(&src, &mut dst);
Read this and this great articles on image resizing technics and resampling filters. Tldr; (with built-in filters of this library) use
Lanczos3 for downscaling, use
Mitchell for upscaling. You may also want to downscale in linear colorspace (but not upscale). Gamma correction routines currently not included to the library, but actually quite simple to accomplish manually, see here for some basic theory.