PNG with No Alpha Channel?

[Trevor DeVore]

On Jun 9, 2008, at 3:58 PM, Josh Mellicker wrote:

> How are you determining whether the exported image has an alpha  
> channel

Preview on OS X and the Quartam PDF library. If you try to save a copy  
of a file as PNG in Preview using "Save As" an "Alpha" checkbox  
appears if the image is 32 bit. The Alpha checkbox is not present if  
the image is not 32 bit. In the Quartam library you can't add 32-bit  
PNG files so demo 6 doesn't work if the PNG has an alpha channel.

-- 
Trevor DeVore
Blue Mango Learning Systems
ScreenSteps: http://www.screensteps.com
Developer Resources: http://revolution.bluemangolearning.com