Transparent sprites in c++ with Allegro

I'm learning to use Allegro. I'm trying to make my character cut out. How do I key out a certain color from my bitmap? which way is used for allegro? Thanks

Solution

These might be places to start:

http://www.allegro.cc/manual/api/blitting-and-sprites/draw_trans_sprite

http://wiki.allegro.cc/index.php?title=Alpha_channel#Drawing_to_the_alpha_channel_in_Allegro

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