How to know the exact colour after a level of transparency being applied?

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Salad Box 2022-9-27

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评论： Salad Box 2022-10-3

Hi,

I am filling an area with a specific colour, say [255 0 0 ], but with a level of transparency, say 0.5. So the actually colour that is going to fill the area is a lot weaker than a pure red 255 0 0.

If I use 'fill' to fill the area, then I

set(h, 'FaceAlpha', 0.5)

what colour do I get?

Is there anywhere I can find out this colour that actually being used to fill the area after 0.5 level of transparency being applied?

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采纳的回答

Jan 2022-9-27

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https://ww2.mathworks.cn/matlabcentral/answers/1813115-how-to-know-the-exact-colour-after-a-level-of-transparency-being-applied#answer_1061800

编辑：Jan 2022-9-27

在 MATLAB Online 中打开

The color you see through a semitransparent element depends on the background. The rule is simple:

alpha      = rand;        % Anything between 0 and 1
Background = rand(1, 3);  % RGB
Foreground = rand(1, 3);
Visible    = Foreground * alpha + Background * (1 - alpha);  % resulting RGB color