create image in red RGB channel - Java 2D Graphics

Java examples for 2D Graphics:BufferedImage Create

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Description

create image in red RGB channel

Demo Code


import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.PixelGrabber;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import org.apache.log4j.Logger;

public class Main{
    /**//ww w .j  a v a2  s .  co m
     * create image in red RGB channel
     * 
     * @param width
     * @param height
     * @param colorModel
     * @return
     */
    public static BufferedImage createRedImage(final int width,
            final int height, final ColorModel colorModel,
            final int[] pixels) {
        int[] redPixels = getRedPixels(width, height, colorModel, pixels);
        return createImage(redPixels, width, height);
    }
    public static int[] getRedPixels(final int width, final int height,
            final ColorModel colorModel, final int[] pixels) {
        int[] result = new int[height * width];
        for (int i = 0; i < result.length; i++) {
            result[i] = getRed(pixels[i], colorModel);
        }
        return result;
    }
    /**
     * creates image from pixels
     * 
     * @param pixels
     * @param width
     * @param height
     * @return
     */
    public static BufferedImage createImage(final int[] pixels,
            final int width, final int height, int type) {
        BufferedImage bufImg = new BufferedImage(width, height, type);
        bufImg.setRGB(0, 0, width, height, pixels, 0, width);
        return bufImg;
    }
    /**
     * creates image from pixels
     * 
     * @param pixels
     * @param width
     * @param height
     * @return
     */
    public static BufferedImage createImage(final int[] pixels,
            final int width, final int height) {
        return createImage(pixels, width, height,
                BufferedImage.TYPE_INT_RGB);
    }
    /**
     * return the red component of the pixel of the image  in java representation than can be summed up with other components to get the summed RGB valued
     * 
     * @param pixel
     *            the pixel number
     * @param colorModel
     * @return
     */
    public static int getRed(final int pixel, final ColorModel colorModel) {
        return colorModel.getRed(pixel);//<<16;
    }
}

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