On Jun 11, 2008, at 9:50 AM, Luis wrote:
Ok, if you look at a 32 bit png in ascii near the start of the file
then you'll spot the bKGD chunk, this defines the background and it
looks like it also contains the alpha value. On a 24 bit png (no
alpha) this value is not present...
The bKGD chunk may not be honoured in all viewers.
I don't know how this change may reflect on the final image but it
might be worth a shot!
The bKGD chunk can be useful for decoders that ignore transparency so
that they will display an appropriate background color. A 24-bit PNG
would have no need of setting this property since all pixels have a
known color and no transparency. I imagine this is why you don't see
it in the 24-bit PNG.
Regards,
--
Trevor DeVore
Blue Mango Learning Systems
www.bluemangolearning.com - www.screensteps.com
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