Function raster::filter::grayscale

pub fn grayscale(src: &mut Image) -> RasterResult<()>

Turn into grayscale image.

Examples

use raster::filter;

let mut image = raster::open("tests/in/sample.jpg").unwrap();
filter::grayscale(&mut image).unwrap();
raster::save(&image, "tests/out/test_filter_grayscale.jpg").unwrap();

Before

After