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!
Cheers,
Luis.
On 11 Jun 2008, at 13:56, Luis wrote:
The export snapshot creates a 32 bit png if the image has an alpha
channel, so it's grabbing the 'display' at 32 bits.
I'm wondering if changing the colour depth to 24 bit the snapshot
will generate a 24 bit png, without the alpha channel.
Cheers,
Luis.
On 11 Jun 2008, at 13:14, Trevor DeVore wrote:
On Jun 11, 2008, at 6:33 AM, Luis wrote:
What are you creating the png images with? I recall seeing
different save options for png in The Gimp, can't recall them
exactly now (I think you could strip out the gamma and the
background from the save as well as setting the interlace).
I'm creating the PNG images in Revolution using export snapshot
and then using the images in PDF documents created using Jan's
library. This is part of an existing end-user application rather
than some sort of workflow I'm trying to create for myself which
is why I was in search of a Revolution only solution rather than
compiling additional libraries that I would have to include for
this one task.
In regards to your question about exporting to GIF and then
converting to PNG -
GIF doesn't have enough colors but even if it did you would still
be back to the original question of how to create a PNG in
Revolution with no alpha channel.
Regards,
--
Trevor DeVore
Blue Mango Learning Systems
www.bluemangolearning.com - www.screensteps.com
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