is BufferedImage Black - Java 2D Graphics

Java examples for 2D Graphics:BufferedImage Color

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Description

is BufferedImage Black

Demo Code


//package com.java2s;
import java.awt.image.BufferedImage;
import java.awt.image.WritableRaster;

public class Main {
    public static boolean isBlack(BufferedImage image, int x, int y) {
        if (image.getType() == BufferedImage.TYPE_BYTE_BINARY) {
            WritableRaster raster = image.getRaster();
            int pixelRGBValue = raster.getSample(x, y, 0);
            if (pixelRGBValue == 0) {
                return true;
            } else {
                return false;
            }/*ww  w. ja v  a 2 s . co m*/
        }

        int luminanceValue = 140;
        return isBlack(image, x, y, luminanceValue);
    }

    public static boolean isBlack(BufferedImage image, int x, int y,
            int luminanceCutOff) {
        int pixelRGBValue;
        int r;
        int g;
        int b;
        double luminance = 0.0;

        // return white on areas outside of image boundaries
        if (x < 0 || y < 0 || x > image.getWidth() || y > image.getHeight()) {
            return false;
        }

        try {
            pixelRGBValue = image.getRGB(x, y);
            r = (pixelRGBValue >> 16) & 0xff;
            g = (pixelRGBValue >> 8) & 0xff;
            b = (pixelRGBValue) & 0xff;
            luminance = (r * 0.299) + (g * 0.587) + (b * 0.114);
        } catch (Exception e) {
            // ignore.
        }

        return luminance < luminanceCutOff;
    }
}

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