DrawImage and transparency

Hi all,

I am trying to display with transparency a TGA image that has R,G,B and alpha channel. The Blitz manual says that DrawBlock paints without taking into account transparency or MaskImage but that Drawimage does take them into account. I am using the latter but all image gets displayed regardless of the information present in the transparency channel. I dont have problems texturing the image on a 3D surface. In that case transparency is fine. But, what I need is 2D painting with transparency. My code:

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Graphics 1280,1024,32,1

im=LoadImage("temp.tga")
While not keyhit(1)
DrawImage im,0,0
Wend
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Thanks for your help

You'll have to write your own alpha/transparency function or use you can use this one:
http://www.blitzbasic.com/codearcs/codearcs.php?code=27

Hope it helps.

Yeah, blitz will only mask pixels. As cermit says, you'll have to do it manually

Understood. Thanks very much. I'll work on the drawalphaimage code...

Jreyes