一个将任意数据编码到图像的库，这种技术也称为隐写术。

这是seagul命令行应用程序的基础。

基本示例

编码

读取一张图片，并使用编码的某些诗句重新保存，使用每个像素蓝色通道的最后2位来编码它们

let encode_result = super::ImageEncoder::from("source.png")
    .set_use_n_lsb(2)
    .set_use_channel(RgbChannel::Blue)
    .encode_data(
        b"
        Midway upon the journey of our life
        I found myself within a forest dark,
        For the straightforward pathway had been lost.
        Ah me! how hard a thing it is to say
        What was this forest savage, rough, and stern,
        Which in the very thought renews the fear.
        So bitter is it, death is little more;
        But of the good to treat, which there I found,
        Speak will I of the other things I saw there.
        I cannot well repeat how there I entered,
        So full was I of slumber at the moment
        In which I had abandoned the true way.",
    );

assert!(encode_result.is_ok(), "Encoding failed");

encode_result
    .unwrap()
    .save("encoded.png", ImageFormat::Png)
    .expect("Could not create output file");

解码

let decoded = ImageDecoder::from("encoded.png")
    .set_use_n_lsb(2)
    .set_use_channel(RgbChannel::Blue)
    .until_marker(Some(b"way.")) // <- If you know how the message ends
    .decode();

assert!(decoded.is_ok());

let decoded = decoded.unwrap().as_raw();

println!("Raw decoded:\n{}", decoded_string);

支持的格式

尽管几乎每个主要的图像格式都支持作为输入，但目前仅支持PNG和BMP作为输出格式。JPEG和其他格式的支持正在计划中。