PNG with No Alpha Channel?

[Klaus Major]

Hi Trevor,

> I need to export a PNG image from a Revolution image control that  
> has no alpha channel information whatsoever.
>
> The 'export' command seems to always include the alpha channel even  
> if there are no transparent areas in the image.
>
> I've also tried loading an image file into an image control an  
> transferring the imageData to another image and then storing the  
> text of the second image in a file (paintCompression set to "png").  
> The file still appears to have an alpha channel though. qrtPDF says  
> the file does and Preview on OS X gives me the option of whether or  
> not to include the Alpha channel if I try to export the resulting  
> image from Preview.
>
> Anyone know how to produce a PNG without an alpha channel using  
> Revolution?

Yes :-)

With alpha:
...
export snapshot from rect(the rect of img 1) of img 1 to file f1 as PNG
...

Without alpha:
...
export snapshot from rect(the rect of img 1) of window(the windowid of  
this stack) to file f2 as PNG
...

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

Best

Klaus Major
klaus at major-k.de
http://www.major-k.de