如何从RGB值中识别可见颜色 [英] How to tell visible color from RGB values

问题描述

我正在工作的图像分析项目，检查rgb值在设置的位置在一个主机的图像，并需要能够知道某个区域是绿色还是蓝色。最初我想我可以通过测试 g> b 在rgb，但我已经认识到，通常可以有更多的蓝色比绿色的绿色图像，由于与红色的混合物。

I'm working an image analyzation project that checks the rgb values at set locations in a host of images, and need to be able to know if a certain area is green or blue. Originally I thought I could do this by testing if g>b in the rgb, but I've come to realize that often there can be more blue than green in a green image, due to the mixture with red. How can I tell- possibly a formula or an algorithm, what a color visibly appears to be based on the rgb?

推荐答案

您可以使用公式或算法来判断颜色是否显示为基于rgb？可以使用 RGB 值转换为 HSB javase / 1.5.0 / docs / api / java / awt / Color.html＃RGBtoHSB％28int，％20int，％20int，％20float []％29rel =nofollow noreferrer>颜色类 RGBtoHSB 方法。所得的色调值在0-1之间，绿色（0,255,0）的色调值为0.33，蓝色（0,0,255）为0.66。

You can convert RGB values to HSB values using the Color classes RGBtoHSB method. The resulting hue value falls between 0-1, with the hue value of green (0,255,0) at 0.33 and blue (0,0,255) at 0.66

float[] hsb = Color.RGBtoHSB(0, 255, 0, null);//green
System.out.println(hsb[0]);
hsb = Color.RGBtoHSB(0, 0, 255, null);//blue
System.out.println(hsb[0]);

从这里可以创建一个色调值更接近绿色的度量，例如任何色调值< 0.5比蓝色更绿。

From this you could create a metric for hue values 'closer' to green, for instance any hue value < 0.5 is more green than blue.

下面是描述颜色在这个颜色空间中如何变化的图像，在X轴上具有色调（注意，在这张图片中，色调从0-360度变化， RGBtoHSB 返回值0-1）

Below is an image depicting how the colors change in this color space, with hue on the X axis (note in this picture hue varies from 0-360 degrees, whereas the RGBtoHSB returns values 0-1)

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