Bou*_*uki 5 java png background gif transparent
我有一个只包含彩色形状和透明背景的gif图像
我想用我想要的颜色替换形状的颜色（此gif的颜色调色板只有2种颜色：在我的情况下为透明和白色）。
我创建了一个过滤器，将白色正确替换为红色（这是测试）
但是我的方法imageToBufferedImage遇到问题，它删除了透明度并将其替换为黑色（不知道为什么）。
所以到目前为止，我所做的是：
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.awt.image.FilteredImageSource;
import java.awt.image.ImageFilter;
import java.awt.image.ImageProducer;
import java.awt.image.RGBImageFilter;
import java.io.File;
import javax.imageio.ImageIO;
public class TestPNG {
public static void main(String[] args) throws Exception {
File in = new File("bg.gif");
BufferedImage source = ImageIO.read(in);
int color = source.getRGB(0, 0);
Image image = makeColorTransparent(source, new Color(color), new Color(255, 0, 0));
BufferedImage transparent = imageToBufferedImage(image);
File out = new File("bg2.gif");
ImageIO.write(transparent, "gif", out);
}
private static BufferedImage imageToBufferedImage(Image image) {
BufferedImage bufferedImage = new BufferedImage(image.getWidth(null), image.getHeight(null), BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = bufferedImage.createGraphics();
//g2.setBackground(Color.blue);
g2.clearRect(0, 0, 200, 40);
g2.drawImage(image, 0, 0, null);
g2.dispose();
return bufferedImage;
}
public static Image makeColorTransparent(BufferedImage im, final Color search, final Color replace) {
ImageFilter filter = new RGBImageFilter() {
public final int filterRGB(int x, int y, int rgb) {
if (rgb == search.getRGB()) {
return replace.getRGB();
} else {
return rgb;
}
}
};
ImageProducer ip = new FilteredImageSource(im.getSource(), filter);
return Toolkit.getDefaultToolkit().createImage(ip);
}
}