Remove Alpha Channel from Bitmaps?

KillerCode · 12-31-2010, 02:30 AM

is there anyway i can remove alpha channel from bitmaps without messing them up?

thanks.

redhatstand · 12-31-2010, 03:52 AM

Hi,

Worth stating which file format(s) you are planning to work with: e.g. did you mean .bmp files exclusively?

I've found (lib)cairo very useful for image manipulation: you may find help commentary in the (lib)cairo source code / docs.

Pretty sure it is on www.sf.net, failing that freshmeat.net

Regards,

Andy T

KillerCode · 12-31-2010, 05:58 AM

i dunno what am i looking for :/

catkin · 12-31-2010, 06:53 AM

Do you want to do it interactively or programatically?

KillerCode · 12-31-2010, 07:03 PM

programatically, im coding in c

dugan · 12-31-2010, 08:24 PM

ImageMagick's "mogrify" utility can deactivate alpha channels. It follows that ImageMagick's C API has functions to remove alpha channels from bitmaps. You can use them, or you can cheat and spawn "mogrify."

John VV · 12-31-2010, 10:29 PM

how many ? one or two ? or 500 ?
for a few i would use Gimp
for many Imagemagick

KillerCode · 01-01-2011, 12:28 AM

but imagemagick is massive library, my whole application is like 200 kb :/ no other solution?

thanks

John VV · 01-01-2011, 12:36 AM

if you are writing a program you could just use CImg.h
http://cimg.sourceforge.net/