Do I have to save the file? Is it possible to directly pass through ImageBuffer to png? I hope to get one vec[u8]

[RyanCode]

        let mut _rgba_image = image::RgbaImage::new(
            (res.dest_right-res.dest_left).into(),
            (res.dest_bottom-res.dest_top).into(),
        );
        _rgba_image.pixels_mut().enumerate().for_each(|pixel| {
            *pixel.1 = Rgba([
                data[pixel.0 * 4 + 0],
                data[pixel.0 * 4 + 1],
                data[pixel.0 * 4 + 2],
                255,
            ])
        });
        _rgba_image.save("pngs/1.png").unwrap();

i need png encod from _rgba_image to a Vec[u8]!!

[HeroicKatora]

You can use ImageBuffer::write_to to provide an explicit Write target. Note that it must be seekable (some formats require seeking back), so you'll want to wrap it in a Cursor temporarily.

use std::io::Cursor;

let output = Cursor::new(vec![]);
rgba_image.write_to(&mut output, ImageOutputFormat::Png)?;
output.into_inner()