Question

我试图在java中得到一个RenderedImage的子部分。比如说图像是100x100，我想要那个图像的右下角

RenderedImage i=...
    x=49;
    y=49;
    width=50;
    height=50;

RenderedImage i2=...

Answer 1

如果您的RenderedImage是BufferedImage，则可以使用getSubImage()方法：

BufferedImage bi = ...;
BufferedImage bi2 = bi.getSubImage(x, y, width, height);

注意：bi2将与bi共享图像数据数组。

如果您的RenderedImage不是BufferedImage，则必须执行更严格的操作＆＃34;方式：

WritableRaster raster = i.getData(new Rectangle(x, y, width, height))
            .createCompatibleWritableRaster();
Hashtable<String,Object> properties = new Hashtable<String,Object>();
for (String name : i.getPropertyNames())
    properties.put(name,i.getProperty(name));

// And finally creating a BufferedImage
// which of course implements RenderedImage:
RenderedImage i2 = new BufferedImage(i.getColorModel(), raster,
       i.getColorModel().isAlphaPremultiplied(), properties);

Java RenderedImage子部分

1 个答案: