java - 通过压缩将 java.awt.Image 转换为 TIFF 字节数组

Question

我有一个 java.awt.Image，需要添加 CCITT T.6 压缩并转换为 TIFF 字节数组。我已经看到了一些使用 TIFFImageWriteParam 和 javax.imageio 包中的其他类的示例，但我找不到从图像到字节数组的完整示例。

这是迄今为止我从扫描获得的 java.awt.Image 开始的内容。这可以很好地生成 TIFF 的字节数组，但我需要找到一种方法，使用 TIFFImageWriteParam 或其他方式来压缩 TIFF，然后再将其处理为字节数组:

thisImage = ... a java.awt.Image from a scanner
if(thisImage!=null){

  ByteArrayOutputStream baos = new ByteArrayOutputStream();
  BufferedImage bimg = new BufferedImage(thisImage.getWidth(null),thisImage.getHeight(null), BufferedImage.TYPE_BYTE_BINARY);  
  bimg.createGraphics().drawImage(thisImage, 0, 0, null);

  try {
    ImageIO.write(bimg, "tiff", baos);                  
  } catch (Exception e) {
    e.printStackTrace();
  }

  thisByteArray = baos.toByteArray();

  ...

如有任何帮助，我们将不胜感激。

Answer 1

我找到了解决方案，感谢:this thread.

这是我最终解决问题的方法:

thisImage = thisImage = ... a java.awt.Image from a scanner
if(thisImage!=null){  
  ByteArrayOutputStream baos = new ByteArrayOutputStream();
  ImageOutputStream ios = ImageIO.createImageOutputStream(baos);
  boolean foundWriter = false;
  BufferedImage bimg = new BufferedImage(thisImage.getWidth(null),thisImage.getHeight(null), BufferedImage.TYPE_BYTE_BINARY);
  bimg.createGraphics().drawImage(thisImage, 0, 0, null); 
  for(Iterator<ImageWriter> writerIter = ImageIO.getImageWritersByFormatName("tif"); writerIter.hasNext() && !foundWriter;) {
    foundWriter = true;
    ImageWriter writer = (ImageWriter)writerIter.next();
    writer.setOutput(ios);
    TIFFImageWriteParam writeParam = (TIFFImageWriteParam)writer.getDefaultWriteParam();
    writeParam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
    writeParam.setCompressionType("CCITT T.6"); 
    writer.prepareWriteSequence(null);
    ImageTypeSpecifier spec = ImageTypeSpecifier.createFromRenderedImage(bimg);
    javax.imageio.metadata.IIOMetadata metadata = writer.getDefaultImageMetadata(spec, writeParam);
    IIOImage iioImage = new IIOImage(bimg, null, metadata);
    writer.writeToSequence(iioImage, writeParam);
    bimg.flush();
    writer.endWriteSequence();
    ios.flush();
    writer.dispose();
    ios.close();
    thisByteArray = baos.toByteArray(); 
    baos.close();
  }
}