从java中的十六进制代码获取颜色名称 [英] Get color name from hex code in java

问题描述

我使用java来查找图像中对象的颜色。
我已经从imgae获得一个像素，然后能够获得该像素的r，g，b值。

I am using java to find out color of an object in the image. I have obtained a pixel from imgae and then able to get the r,g,b values for that pixel.

现在，我想知道这个像素属于哪种颜色。所以我创建了一个映射，将十六进制代码映射到color_names。现在，我遍历地图，找出距离地图中所有条目的最短距离，以及距离到像素的距离最小的一个条目，我将该颜色分配给像素。

Now, I want to know this pixel belongs to which color. So I have created a map which maps hex code to color_names. Now, i traverse map and find out shortest distance from all entries in map and the one entry for which distance is minimum to the pixel I assign that color to pixel.

是我的一些代码： -

Here is some of my code :-

private static String getColorName(int[] rgb) {
    Map<String, String> data = new HashMap<String, String>();
    data.put("00ff00", "GREEN");
    data.put("ff0000", "RED");
    data.put("0000ff", "BLUE");

    data.put("00ffff", "CYAN");
    data.put("ffff00", "YELLOW");
    data.put("ff00ff", "PINK");

    data.put("c8c8c8", "LIGHT GREY");
    //data.put("808080", "GREY");
    data.put("ffc800", "ORANGE");
    data.put("4F3E86", "PURPLE");

    data.put("000000", "BLACK");
    data.put("ffffff", "WHITE");

    String hex = "0123456789abcdef";

    int minD = 256*256*256;
    String res = "";

    for (String key : data.keySet()) {
        int r = hex.indexOf(key.charAt(0))*16 + hex.indexOf(key.charAt(1));
        int g = hex.indexOf(key.charAt(2))*16 + hex.indexOf(key.charAt(3));
        int b = hex.indexOf(key.charAt(4))*16 + hex.indexOf(key.charAt(5));

        int distance = (Math.abs(rgb[0] - r)) + 
                (Math.abs(rgb[1] - g)) + 
                (Math.abs(rgb[2] - b));

        if (distance < minD) {
            res = data.get(key);
            minD = distance;
        }
    }
    return res;
}

现在的问题是，

你可以看到距离函数是： -
D = | r1-r2 | + | g1-g2 | + | b1-b2 |其中| x |表示abs（x）函数
我的黄色被映射为灰色。经过一些调试，我发现这一点。
我应该选择什么距离函数，或者如何改进我的映射？

As you can see Distance function is:- D = |r1-r2| + |g1-g2| + |b1-b2| where |x| indicates abs(x) function My yellow color getting mapped to grey color. After some debugging, i found this. What distance function should i choose or how can i improve my mapping ?

在java中有没有任何内置的东西？
感谢在adv

Does there exist any inbuilt thing for doing this in java? Thanks in adv

推荐答案

Color有一个构造函数需要rgb值，所以：

Color has a constructor that takes rgb values, So:

g.setColor( new Color(0x00, 0x00, 0xff) );

源是：类别颜色

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