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// exr imports
extern crate exr;
/// Read an image and print information about the image into the console.
/// This example shows how to read an image with multiple layers and specific channels.
/// This example does not include resolution levels (mipmaps or ripmaps).
fn main() {
use exr::prelude::*;
let image = read().no_deep_data()
.largest_resolution_level()
.specific_channels()
.optional("A", f16::ONE)
.required("Y") // TODO also accept a closure with a detailed selection mechanism
.optional("right.Y", 0.0)
.collect_pixels(
|resolution, (a_channel, y_channel, y_right_channel)| {
println!("image contains alpha channel? {}", a_channel.is_some());
println!("image contains stereoscopic luma channel? {}", y_right_channel.is_some());
println!("the type of luma samples is {:?}", y_channel.sample_type);
vec![vec![(f16::ZERO, 0.0, 0.0); resolution.width()]; resolution.height()]
},
// all samples will be converted to f32 (you can also use the enum `Sample` instead of `f32` here to retain the original data type from the file)
|vec, position, (a,y,yr): (f16, f32, f32)| {
vec[position.y()][position.x()] = (a, y, yr)
}
)
.all_layers()
.all_attributes()
.on_progress(|progress| println!("progress: {:.1}", progress*100.0))
.from_file("custom_channels.exr")
.expect("run example `4_write_custom_fixed_channels` to generate this image file");
// output a random color of each channel of each layer
for layer in &image.layer_data {
let (alpha, luma, luma_right) = layer.channel_data.pixels.first().unwrap().first().unwrap();
println!(
"top left color of layer `{}`: (a, y, yr) = {:?}",
layer.attributes.layer_name.clone().unwrap_or_default(),
(alpha.to_f32(), luma, luma_right)
)
}
}
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