[Gllug] PNG transparency to BMP transparency

[Zverina, David]

To the best of my knowledge BMP does not support transparency. Hence
transparent pixels have to be assigned some colour. And it might as well be
black considering it's the best colour. :)

However if you really want something else you can easily specify it in the
pngtopnm program. To set the transparent pixels to yellow you should proceed
as follows:

pngtopnm -mix -background "#ffff00" myfile.png | ppmtobmp -windows >
myfile.bmp

Cheers,

Dave.

> -----Original Message-----
> From:	Bruce Richardson [SMTP:itsbruce at uklinux.net]
> Sent:	Thursday, January 03, 2002 10:30 AM
> To:	gllug at linux.co.uk
> Subject:	[Gllug] PNG transparency to BMP transparency
> 
> I have to convert some png files to MS bitmaps.  Annoyingly, transparent 
> areas in the png files become black on the bitmaps.  I've tried several 
> tools and they all seem to do this, including ImageMagick.  Any pointers?
> 
> -- 
> 
> Bruce
> 
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