View Full Version : What's the meaning "A" out of "RGBA"

08-20-2001, 06:14 AM
What's the meaning "A" out of "RGBA" in the model of color?
And how does "A" with "R'."G"."B" compose to color.

08-20-2001, 06:38 AM
A is alpha. It is normally used to set the level of transparency. In OpenGL it can also be used as a mask.

08-20-2001, 07:01 AM
Extension: increasing values indicates more opacity. i.e. zero is completely transparent.