Transparency

[greekgoddj]

Hello,

I have been looking through the IPP Image processing manual and don't seem to find a function for transparency. I thoughts this was quite a common routine in image processing and that I might find it in the IPP. Is it called something else? ..I basically want to copy one image over another, specifying a particular colour to be treated as the transparent colour.

Any ideas?

Thanks,

Aristotel

Message Edited by greekgoddj@hotmail.com on 07-21-2005 03:32 AM

[pascal_bamford]

Aristotel,

The term you are after is 'alpha'. This is the weighting factor used to combine images with transparent effect.

IPP has extensive support for 4 channel images (RGBA where A is alpha). Perhaps start by looking at the functions in section 5 of ippiman.pdf under 'Alpha Composition'.

Pascal.

[greekgoddj]

Thanks for that information Pascal!

Aristotel