Are there different classes of 32-bit color, perhaps "real 32-bit" and "faked/faux 32-bit"?

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2 total messages Started by Ramon F Herrera Tue, 21 Apr 2009 15:45

#77

Author: Ramon F Herrera
Date: Tue, 21 Apr 2009 15:45

23 lines
2053 bytes

I am working on a 16x16 icon for the Windows XP system tray area (in
the lower right corner) and I noticed that if the artist sends me a
*.ico in 32-bit color:

 - MS Visual Studio complains that it cannot *edit* 32-bit color
(which is fine, and reassuring)

but most importantly:

 - The icon looks much nicer (*) than if I use 24-bit color.

The doubt that I have is about IrfanView: it claims that the file in
question is only 24-bit color.

Is there anything about 32-bit color I should know?

TIA,

-Ramon

(*) The staircase lines are gone: it looks like the extra depth info
is used to render the 2D image.

Re: Are there different classes of 32-bit color, perhaps "real 32-bit" and "faked/faux 32-bit"?

#78

Author: Andrew Morton
Date: Tue, 21 Apr 2009 15:55

7 lines
1329 bytes

This thread may give you clues:
http://www.codeguru.com/forum/archive/index.php/t-359902.html

The only "faking" with 32-bit colour goes with pre-multplied alpha:
http://en.wikipedia.org/wiki/User:Lkesteloot/premultiplied_alpha

Andrew

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