Hmm, I don't know if QTPro can do the export as 24 bit png.
Cheers,
Luis.
On 11 Jun 2008, at 15:01, Trevor DeVore wrote:
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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