I remark that there is a parameter A in the color RGB parameter as mentioned in the image below. What is this parameter and what is its effects on RGB color?
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1$\begingroup$ Related: blender.stackexchange.com/q/2261/599 $\endgroup$ – gandalf3♦ Apr 2 '15 at 20:39
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The parameter A stands for alpha, which is the transparency channel. An alpha value of zero represents full transparency and a value of 1.0 represents a fully opaque pixel. The RGB values are not affected by the alpha value.
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