如何将RGB值与颜色进行比较?

时间:2014-05-20 04:57:00

标签: java colors rgb

我正在扫描BufferedImage中的像素,看看是否某些像素是某种颜色。我通过以下方式尝试了这个:

for(int x = 0; x < 16; x++) {
    for(int y = 0; y < 16; y++) {
        if(image.getRGB(x, y) == new Color(209, 167, 86).getRGB()) System.out.println("Same Color Detected!");
    }
}

image.getRGB()会向Color.getRGB()返回不同的值。我该如何比较它们?

这些是值的一些例子(第一个数字来自图像,第二个数字是我正在比较的颜色):

0 : -8060928
-16777216 : -8060928
-3037354 : -8060928
-3037354 : -8060928
-16777216 : -8060928

以下是我获取图片的方式:

playerOrig = ImageIO.read(getClass().getResourceAsStream("/Player/player.gif"));

我正在使用Eclipse和Java 1.6

我打印出图像的ColorModel并得到了这个:

IndexColorModel: #pixelBits = 4 numComponents = 4 color space = java.awt.color.ICC_ColorSpace@45d6a56e transparency = 2 transIndex   = 11 has alpha = true isAlphaPre = false

然后我打印出ColorSpace Color对象的java.awt.color.ICC_ColorSpace@45d6a56e 并得到了这个:

{{1}}

这是图像:

enter image description here

2 个答案:

答案 0 :(得分:1)

适合我...

注意:我在我的本地计算机上测试了代码,它对我很有用,就像你使用默认的ColorModel一样。我正在使用OSX和Java(TM) SE Runtime Environment (build 1.7.0_25-b15)祝你好运!

这是link to my entire Mavenized project on GitHub.com

import javax.imageio.ImageIO;
import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

public class Q23751298
{
    public static void main(String[] args)
    {
        try
        {
        //final BufferedImage img = ImageIO.read(new File("/Users/jhr/Pictures/fu4FM.gif"));
        final BufferedImage img = ImageIO.read(Q23751298.class.getResource("/fu4FM.gif"));
            final int match = new Color(209, 167, 86).getRGB();

            for (int x = 0; x < img.getWidth(); x++)
            {
                for (int y = 0; y < img.getHeight(); y++)
                {
                    final int irgb = img.getRGB(x, y);
                    if (irgb == match)
                    {
                        System.out.format("%d/%d = %d : %d\n", x, y, img.getRGB(x, y), match);
                    }
                }
            }
        }
        catch (IOException e)
        {
            System.out.println(e.getMessage());
        }
    }
}

以下是我发布的16 X 16文件的输出结果:

4/9 = -3037354 : -3037354
4/10 = -3037354 : -3037354
4/11 = -3037354 : -3037354
6/4 = -3037354 : -3037354
7/4 = -3037354 : -3037354
7/5 = -3037354 : -3037354
7/6 = -3037354 : -3037354
7/7 = -3037354 : -3037354
8/4 = -3037354 : -3037354
8/5 = -3037354 : -3037354
8/6 = -3037354 : -3037354
8/7 = -3037354 : -3037354
9/4 = -3037354 : -3037354
9/7 = -3037354 : -3037354
10/5 = -3037354 : -3037354
10/6 = -3037354 : -3037354
12/10 = -3037354 : -3037354
12/11 = -3037354 : -3037354

答案 1 :(得分:1)

根据您提供的样本图像,当图像尺寸为320x320像素时,您只检查图像的16x16网格...

当我更新你的代码以包含图像的整个宽度和高度时,它可以正常工作......

try {
    BufferedImage img = ImageIO.read(...);
    Color match = new Color(209, 167, 86);

    for (int x = 0; x < img.getWidth(); x++) {
        for (int y = 0; y < img.getHeight(); y++) {
            if (img.getRGB(x, y) == match.getRGB()) {
                System.out.println("Same Color Detected!");
            }
        }
    }
} catch (IOException ex) {
    ex.printStackTrace();
}

<强>更新

基于新的,更小的示例,代码仍然有效......

为了证明这一点,我写了一个简单的颜色替换算法...

Original Replaced
Original Replaced

try {
    BufferedImage img = ImageIO.read(new File("8bit.gif"));
    BufferedImage replaced = new BufferedImage(img.getWidth(), img.getHeight(), BufferedImage.TYPE_INT_ARGB);
    Color match = new Color(209, 167, 86);
    Color with = new Color(0, 255, 0);

    for (int x = 0; x < img.getWidth(); x++) {
        for (int y = 0; y < img.getHeight(); y++) {
            int pixel = img.getRGB(x, y);
            if (pixel == match.getRGB()) {
                System.out.println("Same Color Detected!");
                replaced.setRGB(x, y, with.getRGB());
            } else {
                replaced.setRGB(x, y, pixel);
            }
        }
    }

    ImageIO.write(replaced, "png", new File("replaced.png"));

    JOptionPane.showMessageDialog(null, new JLabel(new ImageIcon(replaced)));
} catch (IOException ex) {
    ex.printStackTrace();
}