How many levels of opacity?

by **Pejo Software - Per** » Mar 6, 2004 @ 6:39pm

How many levels of opacity/alpha does GapiDraw use?

If one is satisfied with 64 levels one can reduce the number of multiplications from 3 to 2 per pixel (if you operate on one pixel).

If you operate on 2 pixels you could do the same and reduce the number of multiplications from 1.5 to 1 per pixel but then you have to use only 32 levels.
Is that enough? How does GapiDraw do it?

by **Pejo Software - Per** » Mar 6, 2004 @ 7:44pm

After doing some more thinking I realized that I probably was wrong.
I don't see how it is possible to use reduce it to only one multiplication, I think that the way I came up with would lead to overflow.

by **StephC** » Mar 7, 2004 @ 12:27am

by **bluescrn** » Mar 7, 2004 @ 9:58am

by **Pejo Software - Per** » Mar 7, 2004 @ 10:20am

by **Johan** » Mar 7, 2004 @ 10:56am

by **Johan** » Mar 7, 2004 @ 10:59am

by **Pejo Software - Per** » Mar 7, 2004 @ 11:34am

by **bluescrn** » Mar 7, 2004 @ 11:44am

by **Johan** » Mar 7, 2004 @ 11:56am

How many levels of opacity?

How many levels of opacity?

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