RenderedImage to BufferedImage for multipage-tiff reading [英] RenderedImage to BufferedImage for multipage-tiff reading

问题描述

我正在使用JAI加载多页TIFF图像

I am using JAI to load in multipage TIFF images

File file = workArea[0];
SeekableStream s = new FileSeekableStream(file);

TIFFDecodeParam param = null;

ImageDecoder dec = ImageCodec.createImageDecoder("tiff", s, param);

//first page
RenderedImage op1 =
    new NullOpImage(dec.decodeAsRenderedImage(0),
                    null,
                    OpImage.OP_IO_BOUND,
                    null);

BufferedImage pg1 = new BufferedImage(op1.getWidth(), op1.getHeight(),
                                      BufferedImage.TYPE_INT_RGB);
pg1.getGraphics().drawImage((Image) op1, 0, 0, null);

但是，在最后一行我得到的运行时错误是：

However, in the last line I get a runtime error of:

 Exception in thread "main" java.lang.ClassCastException: 
      javax.media.jai.MullOpImage cannot be cast to java.awt.Image

我在尝试设置BufferedImage后清除了RenderedImage，所以我并不完全需要RenderedImage这是另一种方法。

I clear the RenderedImage after attempting to set the BufferedImage so I don't exactly "need" the RenderedImage if there is another method of doing this.

我尝试过：

 pg1.setData(op1.getData());

，这给出了一个ArrayIndexOutOfBoundsException。我不确定为什么pg1的宽度和高度完全由op1设置，但可能有一个非常正确的原因。

and that gives an ArrayIndexOutOfBoundsException. I'm not sure why exactly as pg1's width and height are set by op1's, but there is probably a very valid reason.

推荐答案

使用op1。 getAsBufferedImage（） 创建pg1。

Use op1.getAsBufferedImage() to create pg1.

这篇关于RenderedImage to BufferedImage for multipage-tiff reading的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！