Simple resampling library in pure Rust.
```rust 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;w1h13];
// Destination buffer. Must be mutable.
let mut dst = vec![0;w2h23];
// 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);
```
See API documentation for overview of all available methods. See also this example.
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.
Comparision of libswscale (4.0.100) with IM (6.9.2.0 Q16 HDRI):
bash
cd examples
convert tiger.png -filter Triangle -resize 540x360 im.png
ffmpeg -i tiger.png -vf scale=540:360:flags=bilinear sws.png
compare sws.png im.png -compose src diff-sws-im.png
Comparision of this library (0.1.0) with IM (6.9.2.0 Q16 HDRI):
bash
../target/debug/examples/resize tiger.png 540x360 rust.png
compare rust.png im.png -compose src diff-rust-im.png
