java - 压缩java中的二维图形写入图像大小

Question

我有一个图像，并在java中使用java.awt.Graphics2D我在图像上写了一个文本。直到这里一切都正常。当我尝试在java中使用ImageWriteParam在java中压缩这个图像时，图片被夸大了。下面是我用来压缩图像大小的代码。不过，此代码对于普通图像来说效果很好。

    File input = new File("Input Image File");
    BufferedImage image = ImageIO.read(input);

    File compressedImageFile = new File("Compressed image file location");
    OutputStream os = new FileOutputStream(compressedImageFile);

    Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jpg");
    ImageWriter writer = (ImageWriter) writers.next();

    ImageOutputStream ios = ImageIO.createImageOutputStream(os);
    writer.setOutput(ios);

    ImageWriteParam param = writer.getDefaultWriteParam();

    param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
    param.setCompressionQuality(1.0f);  // Change the quality value you prefer
    try {
        writer.write(null, new IIOImage(image, null, null), param);
        System.out.println(writer);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    os.close();
    ios.close();
    writer.dispose();

感谢任何帮助。谢谢!

Answer 1

您使用默认的ImageWriterParams，使用writer.getDefaultWriteParam()。但正如 API of the ImageWriter 中提到的它在这里说:

[...] The default implementation constructs and returns a new ImageWriteParam object that does not allow tiling, progressive encoding, or compression...

还有关于如何处理该问题的提示，

individual plug-ins may return an instance of ImageWriteParam with additional optional features enabled, or they may return an instance of a plug-in specific subclass of ImageWriteParam.