Re: [pygame] Overwrite color not alpha?

[Kamilche <klachemin@xxxxxxxxxxx>]

Brian Fisher wrote:
> SDL has some possibly non-intuitive rules about how to do the blit
> ased on whether the SDL_SRCALPHA flag is set on the source and whether
> the source and dest are RGB or RGBA. I don't know if you can find that
> info in the pygame docs or not (anybody know?) but it is in the SDL
> documentation for SDL_SetAlpha
>
> here's a random version of that doc page
> http://manuals.thexdershome.com/SDL-1.2.5/html/sdlsetalpha.html

Oh what a relief! Thanks for that page. I knew there were differences in 
blitting alpha, I've tripped over them many times in the past, but I 
never knew what the rules were.

BTW, I finally gagged down Pete Shinner's surfarray and Numeric 
tutorial. It's time. :-D This line ended up letting me modify the color 
of an RGBA surface, while preserving the alpha channel:

    pygame.surfarray.pixels3d(pic)[:, :, :3] = (255,0,0)

where 'pic' is the pygame surface, and (255,0,0) is the color red.