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How exactly are layers / optional content groups meant to work?

Posted: Mon Jan 08, 2018 3:33 pm
by floele

GdPicture v12 has added support for PDF layers AKA optional content groups but I can't really get it to work.
My first try was using the sample code from ... ewOCG.html

My expectation is a PDF file containing an additional layer "Image layer" which contains an image. The result, however, is the attached PDF. No image, no layer.

My second try was the sample code from ... ntent.html.
This time there is some content visible, but still no layers.

For reference, I also attached a PDF file that actually contains layers. How would I create a PDF file with GdPicture that works like the attached PDF?

Best regards,