How to effectively color pixels in a BufferedImage?
- by Ed Taylor
I'm using the following pice of code to iterate over all pixels in an image and draw a red 1x1 square over the pixels that are within a certain RGB-tolerance. I guess there is a more efficient way to do this? Any ideas appreciated. (bi is a BufferedImage and g2 is a Graphics2D with its color set to Color.RED).
Color targetColor = new Color(selectedRGB);
for (int x = 0; x < bi.getWidth(); x++) {
for (int y = 0; y < bi.getHeight(); y++) {
Color pixelColor = new Color(bi.getRGB(x, y));
if (withinTolerance(pixelColor, targetColor)) {
g2.drawRect(x, y, 1, 1);
}
}
}
private boolean withinTolerance(Color pixelColor, Color targetColor) {
int pixelRed = pixelColor.getRed();
int pixelGreen = pixelColor.getGreen();
int pixelBlue = pixelColor.getBlue();
int targetRed = targetColor.getRed();
int targetGreen = targetColor.getGreen();
int targetBlue = targetColor.getBlue();
return (((pixelRed >= targetRed - tolRed) && (pixelRed <= targetRed + tolRed)) &&
((pixelGreen >= targetGreen - tolGreen) && (pixelGreen <= targetGreen + tolGreen)) &&
((pixelBlue >= targetBlue - tolBlue) && (pixelBlue <= targetBlue + tolBlue)));
}
