Open peter-borgstedt opened 6 years ago
Well, it is possible, but I don't know if there is an easy way. You will need to find the graphic state object in the parent of the image stream dictionary. It could be something like
/Resources
/Obj {ExtGState, ImageObject}
/ExtGState
/GS1 or GS2
/ca 0.5
/ImageObject
/Stream
It seems that it is possible to have transparent background on a PDF, as transparent fonts, images objects etc.
How do I check if a background is transparent? In Acrobat i read it is always white whether transparent or not, but in other readers it might not be so.