49 lines
1.8 KiB
Rust
49 lines
1.8 KiB
Rust
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extern crate image as png;
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extern crate exr;
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/// Read an rgba image, or fail if none can be found.
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/// Then crop away transparent pixels,
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/// and write the cropped result to another file.
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/// This retains only the rgb pixels, and no other layers.
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pub fn main() {
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use exr::prelude::*;
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use exr::image::pixel_vec::*; // import predefined pixel storage
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let path = "tests/images/valid/custom/oh crop.exr";
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type DynamicRgbaPixel = (Sample, Sample, Sample, Sample); // `Sample` is an enum containing the original data type (f16,f32, or u32)
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// load an rgba image
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// this specific example discards all but the first valid rgb layers and converts all pixels to f32 values
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// TODO optional alpha channel!
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let image: PixelImage<PixelVec<DynamicRgbaPixel>, RgbaChannels> = read_first_rgba_layer_from_file(
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path,
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PixelVec::<DynamicRgbaPixel>::constructor,
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// use this predefined rgba pixel container from the exr crate, requesting any type of pixels with 3 or 4 values
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PixelVec::set_pixel
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).expect("this file exists in the exrs repository. download that?");
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// construct a ~simple~ cropped image
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let image: Image<Layer<CroppedChannels<SpecificChannels<PixelVec<DynamicRgbaPixel>, RgbaChannels>>>> = Image {
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attributes: image.attributes,
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// crop each layer
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layer_data: {
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println!("cropping layer {:#?}", image.layer_data);
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// if has alpha, crop it where alpha is zero
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image.layer_data
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.crop_where(|(_r, _g, _b, alpha)| alpha.is_zero())
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.or_crop_to_1x1_if_empty() // do not remove empty layers from image, because it could result in an image without content
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},
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};
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image.write().to_file("cropped_rgba.exr").unwrap();
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println!("cropped file to cropped_rgba.exr");
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}
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