Java将RGB转换为CMY图片

Question

我正在尝试将RGB（色彩空间）图片转换为CMY（色彩空间）图片。我可以读取特定的（RGB）图片，但实际上我的问题是将其写入或保存为CMY图片。图片，我要转换的是以下内容：

Picture

我写了以下代码：

import java.awt.Color;
import java.awt.image.BufferedImage;
import java.awt.image.ColorConvertOp;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

public class Aufgabe2c {

    public static void main(String[] args) {
        try {
            BufferedImage image = ImageIO.read(new File("blumen.bmp"));
            iterateThroughImage(image);

        } catch (IOException e) {
            e.printStackTrace();
        }

    }
    public static void iterateThroughImage(BufferedImage image) {
        int w = image.getWidth();
        int h = image.getHeight();
        System.out.println("width, height: " + w + ", " + h);

        for (int i = 0; i < h; i++) {
            for (int j = 0; j < w; j++) {
                System.out.println("x,y: " + j + ", " + i);
                int pixel = image.getRGB(j, i);
                getPixelARGB(pixel);
                System.out.println("");
            }
        }
    }

    public static void getPixelARGB(int pixel) {
        int alpha = (pixel >> 24) & 0xff;
        int red = (pixel >> 16) & 0xff;
        int green = (pixel >> 8) & 0xff;
        int blue = (pixel) & 0xff;
        System.out.println("argb: " + alpha + ", " + red + ", " + green + ", " + blue);
    }

    public static void convertRGBToCMY(int red, int green, int blue) {
        int cyan = 255 - red;
        int magenta =  255 - green;
        int yellow =  255 - blue;

        System.out.println("argb: "+ red + ", " + green + ", " + blue);
    }
}

我在方法iterateThroughImage(BufferedImage image)中将rgb值作为单个int值获取，并将其存储在int变量pixel中。我在方法getPixelARGB(int pixel)中获得每个红色，绿色，蓝色和Alpha值。

我的问题实际上是我不知道如何将给定的特定RGB图片转换为CMY（色彩空间）图片。

顺便说一句：Pazhamalai G的答案中的链接不可用，因为“ under”页面ist不再可用。

我发现了与此问题相关的非常相似的问题。我在那儿张贴了问题，但已被删除（由于我不知道的原因）。其以下问题：Writing java program about RGB-CMY

我希望你能帮助我。

Answer 1

这里可能是一个解决方案：

import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

public class Aufgabe2c {

    public static void main(String[] args) {
        try {
            BufferedImage image = ImageIO.read(new File("blumen.bmp"));
            iterateThroughImageToGetPixel(image);

        } catch (IOException e) {
            e.printStackTrace();
        }

    }
    public static void iterateThroughImageToGetPixel(BufferedImage image) {
        try {
            BufferedImage cmyImage = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_INT_RGB);

            System.out.println("width, height: " + image.getWidth() + ", " + image.getHeight());

            for (int column = 0; column < image.getHeight(); column++) {
                for (int row = 0; row < image.getWidth(); row++) {
                    System.out.println("x,y: " + row + ", " + column);
                    int pixel = image.getRGB(row, column);
//                  getPixelCMYValuesFromARGBValuesPerPixel(pixel).getRGB();
                    cmyImage.setRGB(row, column, getPixelCMYValuesFromARGBValuesPerPixel(image.getRGB(row, column)).getRGB());              

                    System.out.println("");
                    System.out.println("----------------------------------------------------------------------------");
                }
            }
            System.out.println("#####################################################");
            ImageIO.write(cmyImage, "bmp", new File("blumen_cmy.bmp") );
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } // Save as BMP
    }
    /*
     * Quelle: https://alvinalexander.com/blog/post/java/getting-rgb-values-for-each-pixel-in-image-using-java-bufferedi
     *         http://openbook.rheinwerk-verlag.de/javainsel9/javainsel_20_006.htm#mj4c12381d5bacf8fb6ee31448d26890bb
     */
    public static Color getPixelCMYValuesFromARGBValuesPerPixel(int pixel) {
        int alpha = (pixel >> 24) & 0xff;
        int red = (pixel >> 16) & 0xff;
        int green = (pixel >> 8) & 0xff;
        int blue = (pixel) & 0xff;

        System.out.println("argb: " + alpha + ", " + red + ", " + green + ", " + blue);

        return convertRGBToCMY(red, green, blue);
    }

    public static Color convertRGBToCMY(int red, int green, int blue) {
        int[] cmyArray = new int[3];

        //cyan
        int cyan = 255 - red;
        //magenta
        int magenta = 255 - green;
        //yellow
        int yellow = 255 - blue;
        return new Color(cyan, magenta, yellow);
    }
}

希望是有帮助的