如何比较两种颜色 [英] How to compare two colors

问题描述

我想设计一个程序，可以帮助我5 pre定义颜色哪一个更类似于一个可变的色彩，并用多少比例的评估。问题是，我不知道该怎么做一步的手动步骤。所以也就更难以想到的方案。

I want to design a program that can help me assess between 5 pre-defined colors which one is more similar to a variable color, and with what percentage. The thing is that I don't know how to do that manually step by step. So it is even more difficult to think of a program.

更多细节：颜色是从管凝胶，由于不同颜色的照片。我有5个管用不同的颜色分别为每个被重新的1 5的水平presentative。我想利用其他样品，并在电脑上的照片，以评估其水平样本属于比较颜色，我想知道，用近似的百分比了。我想一个程序，它是这样的：<一href="http://www.colortools.net/color_matcher.html">http://www.colortools.net/color_matcher.html

More details: The colors are from photographs of tubes with gel that as different colors. I have 5 tubes with different colors were each is representative of 1 of 5 levels. I want to take photographs of other samples and on the computer assess to which level that sample belongs by comparing colors, and I want to know that with a percentage of approximation too. I would like a program that does something like this: http://www.colortools.net/color_matcher.html

如果你能告诉我采取什么步骤，即使他们的事情，我想和做手工。这将是非常有益的。

If you can tell me what steps to take, even if they are things for me to think and do manually. It would be very helpful.

推荐答案

请参阅维基百科上色差文章权线索。 基本上，你要计算在一些多维色彩距离度量。 但RGB不是视觉上保持一致性，所以你的欧几里德RGB距离度量由瓦迪姆建议将不匹配的颜色之间的人类感知距离。一开始，的L * a * b *表旨在是一个感知上一致的色彩空间，并且DeltaE值度量是常用。但也有更精致的色彩空间和更精致的DeltaE公式，更接近匹配的人类感知。

See Wikipedia's article on Color Difference for the right leads. Basically, you want to compute a distance metric in some multidimensional colorspace. But RGB is not "perceptually uniform", so your Euclidean RGB distance metric suggested by Vadim will not match the human-perceived distance between colors. For a start, L*a*b* is intended to be a perceptually uniform colorspace, and the deltaE metric is commonly used. But there are more refined colorspaces and more refined deltaE formulas that get closer to matching human perception.

您将有更多地了解色彩空间和照明做转换。但对于一个快速公式比欧几里德RGB指标更好，只是这样的：假设你的RGB值都在sRGB的色彩空间，找到sRGB进行的L * a * b *的转换公式，转换sRGB的色彩来的L * a * b *表，和计算的DeltaE你的两个的L * a * b *值之间。这不计算成本的，它只是一些非线性公式和一些乘法，并补充说。

You'll have to learn more about colorspaces and illuminants to do the conversions. But for a quick formula that is better than the Euclidean RGB metric, just do this: assume that your RGB values are in the sRGB colorspace, find the sRGB to L*a*b* conversion formulas, convert your sRGB colors to L*a*b*, and compute deltaE between your two L*a*b* values. It's not computationally expensive, it's just some nonlinear formulas and some multiplies and adds.

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