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Transparency

Started by Derilect101 Apr 17, 2001 at 2:09 AM 3 replies 250+ views

Original Post

Apr 17, 2001 at 2:09 AM

Just out of curiousity I have been going through the gl header files and was just curious if you can actually strip out certain colors using the blending function (aka transparent blitting) using that function. Also if there is another function built in for that would like to know.

ursa

Apr 17, 2001 at 7:11 AM

U can try Accum function out.

Maximus

Apr 17, 2001 at 7:45 AM

If you mean making only certain colours transparent or translucent, you can, but not through OpenGL. When you load the texture, do a sweep over every pixel and check its rgb value, and if its the colour you want transparent, then alter its alpha value.

The Kid

Apr 18, 2001 at 10:05 PM

Maximus, how would you go about doing that ?

Edited by - The Kid on April 18, 2001 11:09:02 PM

Derilect101

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Derilect101

Apr 18, 2001 at 11:18 PM

It was posted in another section after you load in your graphics image go through the image data and if the color in the image data is the same as the one you want transparent then add another bit to it and alter the value to it just so later you can tell if its transparent. So basically making a 24 bit image to a 32 bit just adding the extra alpha channel to it RGBA

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