Attached is my sketchup file. I go to file export image .png without a background in styles. Then I drop both the exported .png sketchup image and a background image into a program like inDesign or Pages, and place the .png over the photograph.
I avoid inserting images into my sketchup files to keep file sizes down for speedy 3D modeling.
Perhaps this is an unknown selection or preset I am missing within sketchup 2017, resulting in user error. I’ll update the post if that is the case.
Attached to this email are the 2017 image and sketchup file. I’ll follow up this e-mail with the 2016 image and file.
Now i understand what you’re getting at. The pixels from the partially transparent region in the exported image are not partially transparent in the PNG. Hmmm… I’ll have to look when I get home. I’ve never combined images that way and wouldn’t have expected them to be transparent in the PNG but i’ll play with it and see.