Incompl描述的getRGB/setRGB方法应该起作用.但是，如果我没记错的话，它的性能相当差(这些方法做了很多工作，在这种情况下是不必要的).我认为，使用新图像并让Java优化从BufferedImage.TYPE_USHORT_GRAY到BufferedImage.TYPE_INT_RGB的转换会更快得多:

The getRGB/setRGB method described by Incompl should work. But, its performance is rather poor, if I remember correctly (these methods do a lot of work that is unnecessary in this case). I think it would be much faster to draw on the new image and let Java to optimize the conversion from BufferedImage.TYPE_USHORT_GRAY to BufferedImage.TYPE_INT_RGB:

int width = grayImage.getWidth();
int height = grayImage.getHeight()

BufferedImage newImage = new BufferedImage(
    width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = newImage.getGraphics();  
g.drawImage(grayImage, 0, 0, null);  
g.dispose();