How can I create a grayscale image from a color image?
Created May 4, 2012
Bill Day BufferedImage is a powerful new capability provided by
Java 2. You can use the BufferedImage to access the
pixel-by-pixel RGB information to decide if the pixels
fall within some arbitrary desired color range, then set
them to whatever values you like.
You can create grayscale images some other way
if you like. So long as your R, G, and B values for
a given pixel are the same (for instance, all '10' or
all '137'), you will have a gray pixel.
If you have a BufferedImage, there's an operation that will do the color conversion for you. Here's a simple example that shows how you can convert any BufferedImage to grayscale.
public static BufferedImage convertToGrayscale(BufferedImage source) {
BufferedImageOp op = new ColorConvertOp(
ColorSpace.getInstance(ColorSpace.CS_GRAY), null);
return op.filter(source, null);
}
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