使用Java ImageIO进行Tiff压缩
我在将png转换为tiff时遇到问题。转换很好,但是图像很大。我认为问题是我没有正确执行压缩?有人有什么建议吗?
这是代码示例
public static void test() throws IOException { // String fileName = "4958813_1";
String fileName = "4848970_1";
String inFileType = ".PNG";
String outFileType = ".TIFF";
ImageIO.scanForPlugins();
File fInputFile = new File("I:/HPF/UU/" + fileName + inFileType);
InputStream fis = new BufferedInputStream(new FileInputStream(
fInputFile));
PNGImageReaderSpi spi = new PNGImageReaderSpi();
ImageReader reader = spi.createReaderInstance();
ImageInputStream iis = ImageIO.createImageInputStream(fis);
reader.setInput(iis, true);
BufferedImage bi = reader.read(0);
TIFFImageWriterSpi tiffspi = new TIFFImageWriterSpi();
ImageWriter writer = tiffspi.createWriterInstance();
//Iterator<ImageWriter> iter = ImageIO.getImageWritersByFormatName("TIFF");
//ImageWriter writer = iter.next();
ImageWriteParam param = writer.getDefaultWriteParam();
param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
param.setCompressionType("LZW");
param.setCompressionQuality(0.5f);
File fOutputFile = new File("I:\\HPF\\UU\\" + fileName + outFileType);
ImageOutputStream ios = ImageIO.createImageOutputStream(fOutputFile);
writer.setOutput(ios);
writer.write(bi);
}
回答:
Writer.getDefaultWriteParam()
仅创建一个ImageWriteParam
对象,不会将其链接回其他任何对象。
我看不到您的代码中有任何机制param
可用于ImageWriter
。
我相信代替:
writer.write(bi);
您需要使用:
writer.write(null, new IIOImage(bi, null, null), param);
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