Expected size is not equal to the real size... about image HOT 3 CLOSED

The code you provided never actually decodes the contents of image_data. That's a problem because PngEncoder::write_image takes raw uncompressed pixels (with the layout specified by the color type argument). The data should be exactly 4 * width * height bytes.

from image.

@fintelia Could you give me an example of how to properly decode the png from raw bytes read from the file? I've also tried the following, but with no success:

let img = image::io::Reader::open("/home/mat/Downloads/image.png")
    .unwrap()
    .decode()
    .unwrap();

let image_data = img.as_bytes();
let mut output = Vec::with_capacity(image_data.len());
// if image_sub_type == "png" {
let image = image::codecs::png::PngEncoder::new_with_quality(
    &mut output,
    CompressionType::Fast,
    FilterType::Adaptive,
);

image.write_image(
    image_data,
    img.width(),
    img.height(),
    ColorType::Rgba8,
)?;

from image.

Never mind, I've figured I shall use img.color() and pass it to the color type argument.

from image.