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exr 1.3.0

Read and write OpenEXR files without any unsafe code
Documentation 
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// exr imports
extern crate exr;

/// Create an image with strange channels and write it to a file.
fn main() {
    use exr::prelude::*;

    let pixels = SpecificChannels::build()
        .with_channel("Kharthanasus Korthus")
        .with_channel(" Trochäus ")
        .with_channel("11023")
        .with_channel("*?!")
        .with_channel("`--\"")
        .with_channel("\r\r\r\n\n")
        .with_pixel_fn(|position|{
            if position.0 < 1000 {
                (f16::from_f32(0.2), 0.666_f32, 4_u32, 1532434.0213_f32, 0.99999_f32, 3.142594_f32/4.0)
            }
            else {
                (f16::from_f32(0.4), 0.777_f32, 8_u32, 102154.3_f32, 0.00001_f32, 3.142594_f32/4.0)
            }
        });

    let image = Image::from_channels((2000, 1400), pixels);

    // print progress only if it advances more than 1%
    let mut current_progress_percentage = 0;

    image.write()
        .on_progress(|progress| {
            let new_progress = (progress * 100.0) as usize;
            if new_progress != current_progress_percentage {
                current_progress_percentage = new_progress;
                println!("progress: {}%", current_progress_percentage)
            }
        })
        .to_file("tests/images/out/strange_channels.exr").unwrap();

    println!("created file strange_channels.exr");
}