降低Java中的图像分辨率

这是工作代码

public class ImageCompressor {    public void compress() throws IOException {        File infile = new File("Y:\img\star.jpg");        File outfile = new File("Y:\img\star_compressed.jpg");        BufferedInputStream bis = new BufferedInputStream(new FileInputStream(     infile));        BufferedOutputStream bos = new BufferedOutputStream(     new FileOutputStream(outfile));        SeekableStream s = SeekableStream.wrapInputStream(bis, true);        RenderedOp image = JAI.create("stream", s);        ((OpImage) image.getRendering()).setTileCache(null);        RenderingHints qualityHints = new RenderingHints(     RenderingHints.KEY_RENDERING,     RenderingHints.VALUE_RENDER_QUALITY);        RenderedOp resizedImage = JAI.create("SubsampleAverage", image, 0.9,     0.9, qualityHints);        JAI.create("enpre", resizedImage, bos, "JPEG", null);    }    public static void main(String[] args) throws IOException {        new ImageCompressor().compress();    }}

这段代码对我来说很棒。如果需要调整图像大小，则可以在此处更改x和y比例J

AI.create("SubsampleAverage", image, xscale,yscale, qualityHints)