从计算的blendmode提取src的公式是什么? [英] What is the formula for extracting the src from a calculated blendmode?
问题描述
如何使用alpha混合公式从2个混合在一起的结果中获得src rgb颜色
How does one go about using a alpha blending formula to achieve the src rgb color from the resultant of the 2 blended together
推荐答案
好吧,您只需重新排序 alpha混合方程
Well, you can just reorder the alpha blending equation
Value =(1− α )· 值 0 + α · Value 1
Value = (1 − α) · Value0 + α · Value1
但是,该等式中有四个变量:α ,值,值 0 和 Value 1 。您需要知道其中三个才能计算出第四个。因此,在您的情况下,您知道生成的颜色 Value ,α 以及 Value 0 。然后,您可以重新排序方程式,如下所示:
However, there are four variables in that equation: α, Value, Value0 and Value1. You need to know three of them to calculate the fourth. So in your case you know the resulting color, Value, the α and maybe Value0. You can then reorder the equation as follows:
− α · 值 1 =(1− α )· 值 0 − 值
−α · Value1 = (1 − α) · Value0 − Value
值 1 =(− 1 / α )· ((1− α )· Value 0 − Value )
Value1 = (−1/α) · ((1 − α) · Value0 − Value)
也就是说,如果我理解正确的话。事实并非如此。您可能要澄清您的问题。
That is, if I understood you correctly. Which might not be the case. You might want to clarify your question.
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