如何将BufferedImage转换为特定颜色?
特别是我的图像在透明的情况下都是纯黑色的。我想在绘制图像时为图像分配简单的颜色,以便将黑色区域更改为新颜色。
我尝试使用仅返回所需颜色的RGBImageFilter,但出现了问题,根本没有绘制任何内容。(ColourFilter扩展了RGBImageFilter,并仅在其filterRGB()方法中返回设置的颜色。)
BufferedImage tileImage = _tiles.get( tileID );ColourFilter cFilt = new ColourFilter();
cFilt.setColour( colour );
FilteredImageSource filteredSrc = new FilteredImageSource( tileImage.getSource(), cFilt );
Image finalImage = Toolkit.getDefaultToolkit().createImage(filteredSrc);
bufferGraphics2D.drawImage(finalImage.....
回答:
查看AlphaComposites,尤其是DST_IN:
BufferedImage original = ... // dimensions width x height, black on transparent// create red image
BufferedImage redVersion = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = (Graphics2D) redVersion.getGraphics();
g.setColor(Color.red);
g.fillRect(0, 0, width, height);
// paint original with composite
g.setComposite(AlphaComposite.DstIn);
g.drawImage(image, 0, 0, width, height, 0, 0, width, height, null);
// redVersion is now a red version of original
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