PNG with No Alpha Channel?

[Luis]

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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