好的,这是我们的问题:
我们正在尝试使用imageio将一系列黑白.tiff文件转换为jpeg2000 .jpf文件。我们总是会看到.jpf文件,但它们通常没有指定的图层数或缩放比例。
这是我们的代码:
//Get the tiff reader
Iterator<ImageReader> readerIterator = ImageIO.getImageReadersByFormatName("tiff");
ImageReader tiffreader = readerIterator.next();
//make an ImageInputStream from our tiff file and have the tiff reader read it
ImageInputStream iis = ImageIO.createImageInputStream(itemFile);
tiffreader.setInput(iis);
//just pass empty params to the tiff reader
ImageReadParam tparam;
tparam = new TIFFImageReadParam();
IIOImage img = tiffreader.readAll(0, tparam);
//set up target file
File f = new File(itemTargetDirectory.getAbsolutePath() + "/" + destFileName);
//we have tried FILTER_97 as well as different ProgressionTypes and compression settings
J2KImageWriteParam param;
param = new J2KImageWriteParam();
param.setProgressionType("layer");
param.setFilter(J2KImageWriteParam.FILTER_53);
//Our problem is that this param is not always respected in the resulting .jpf
param.setNumDecompositionLevels(5);
//get the JPEG 2000 writer
Iterator<ImageWriter> writerIterator = ImageIO.getImageWritersByFormatName("JPEG 2000");
J2KImageWriter jp2kwriter = null;
jp2kwriter = (J2KImageWriter) writerIterator.next();
//write the jpf file
ImageOutputStream ios = ImageIO.createImageOutputStream(f);
jp2kwriter.setOutput(ios);
jp2kwriter.write(null, img, param);
这是一个奇怪的经历,因为同一代码在后续运行中的行为有所不同。
任何见解将不胜感激!
最佳答案
是否所有TIFF文件都具有相同的设置(颜色模型)? J2KImageWriter.java显示当索引颜色或多像素打包的源图像用作输入时,分解级别被设置(强制)为零。