如何将BufferedImage转换为某种颜色？ [英] How to convert a BufferedImage to a certain colour?

问题描述

明显地，我有透明的全黑的图像。

Speicifically I have images that are all solid black on transparent. I want to assign an abritrary colour to the images when they are drawn so that the black areas are changed to the new colour.

我试图使用一个RGBImageFilter，它只是返回了一个RGBImageFilter颜色我想，但事情出了问题，没有什么正在绘制。 （ColourFilter扩展RGBImageFilter，并且只返回它的filterRGB（）方法中的设置颜色。）

I tried using a RGBImageFilter that just returned the colour I want but something's going wrong and nothing is being drawn at all. (ColourFilter extends RGBImageFilter and just returns the set colour in it's filterRGB() method.)

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.....

推荐答案

查看 AlphaComposites ，特别是DST_IN ：

Look at AlphaComposites, particularly 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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