为什么RGB到XYZ颜色转换有这样的区别？ [英] Why is there such a difference between RGB to XYZ color conversions?
问题描述
最近我一直试图理解在RGB颜色空间和CIE-XYZ颜色空间之间转换的代码，但似乎每个不同的计算器，我尝试给我完全不同的结果。
例如，尝试将（255，100，70）转换为XYZ会产生以下结果，即使明确使用d50作为一切：
Recently I have been trying to understand code that converts between the RGB color space and the CIE-XYZ color space, but it seems like every different calculator I try gives me radically different results. For example, trying to convert (255, 100, 70) to XYZ yields the following result, even when explicitly using d50 for everything:
- EasyRGB 提供（46.903，30.817，9.270）
- Wolfram Alpha 提供（0.7493 ，0.7245,0.6308）
- Bruce Lindbloom.com给出了（0.493910,0.317574,0.070047）
- Java给出（0.95880127,0.99554443,0.8227539） li>
- EasyRGB gives (46.903, 30.817, 9.270)
- Wolfram Alpha gives (0.7493, 0.7245, 0.6308)
- Bruce Lindbloom.com gives (0.493910, 0.317574, 0.070047)
- Java gives (0.95880127, 0.99554443, 0.8227539)
我看不出这些可能给出不同的答案。哪一个是正确的（如果有）？
I don't see how these could possibly give such different answers. Which one is correct (if any)? Is there some sort of parameter that I am missing that differs between these websites?
推荐答案
因为有不同的RGB空间，不只是一个。
Because there are different RGB spaces, not just one.
在此页面上有以下通用公式：
On this page there is the general formula:
http://brucelindbloom.com/index.html?Eqn_RGB_to_XYZ.html
但通式取决于一些参数，例如矩阵M，其对于每个单独的RGB空间是不同的。
but the general formula depends on some parameters e.g. matrix M, which is different for each individual RGB space.
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