Re: [pygame] How do I make a image transparent?

[Ethan Glasser-Camp <glasse@xxxxxxxxxx>]

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Greg Ewing wrote:
> Luke Paireepinart wrote:
>> But this is per-pixel alpha, which is slower than colorkey
>> transparency, I believe.
> 
> In theory it may be, but I haven't found this to be a
> problem. As a benefit, you get better-looking results
> due to anti-aliasing of the edges (assuming your alpha
> channel has been created appropriately, and doesn't
> just consist of all 0 or 255).

Hi,

Just want to chip in that for my game it is definitely a problem, and
getting rid of alpha is a necessary optimization. I'm redrawing the
whole screen every frame, and there are usually dozens, sometimes
hundreds of sprites. If there were a convert() function that changed
fully-transparent alpha into a colorkey, I would use that; as it is, I
have to do post-processing on art my artist sends me. (I'm reminded of
the thread a couple weeks ago about transform.chop and its use in art
post-production.)

Ethan
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