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。我在javax.imageio包中看到了一些使用TIFFImageWriteParam和其他类的例子，但我找不到一个从Image到字节数组的完整例子。

以下是迄今为止我从扫描得到的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或其他方法，在将TIFF处理为字节数组之前压缩它：

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

我找到了一个解决方案，这要归功于：这个线程。

以下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();
  }
}