Exporting PNG images

[richmond62]

This is a response to a current posting on the Use-List:

"I want to compose an image using a bunch of LC objects, then export a PNG, with an alpha channel containing a mask (ideally > 1 bit, but that part's not critical).
The documentation for export snapshot is not very clear. I've tried things like exporting a transparent group containing some objects; the PNG was just filled with black where there were no objects.
There is an option "with mask xx", but it appears that this is only for PBM format - and in any case I can't make it work.
Is there any way to do this?" [my bolding]

Pingu.livecode.zip

Stack to export PNG with transparent areas

(16.99 KiB) Downloaded 187 times

decor2.png (1.77 KiB) Viewed 2721 times

http://lessons.livecode.com/m/4071/l/68 ... ndow-shape

[richmond62]

pongu.png (21.3 KiB) Viewed 2721 times

Pongu.livecode.zip

Stack with windowShape set to image

(2.3 KiB) Downloaded 216 times

[richmond62]

The image "decor2.png" is exported from a group consisting of an image and a graphic object.

Group everything!