Hi!
Maybe someone has an answer for this:
I try to give an alpha to a bitmap by using pasteBitmap with the following function
function mix_alpha S Sc D Dc=
(
R = S
R.alpha = 255 - ((D.r + D.g + D.b)/3)
R
)
pasteBitmap final_mix01 final_mix02 [0,0] [0,0] type:#function function:mix_alpha
What should happen:
The source bitmap should stay intact but use the destination bitmap as alpha.
What happens:
I just get a fully white alpha channel! No alpha values at all!
I don’t know what to do because I think I tried anything!
I used pngio.setType #true48 and pngio.setAlpha true, copied the bitmaps before saving, I tried getPixels to test if there is a bug in pasteBitmap,…
Any solution?
Does the source bitmap have a alpha channel to start with?
You can’t add a alpha channel when the target (source in your case) image doesn’t have an alpha channel.
-Johan
Thank you for that information! I will check it out.
Greetings
Fabian