> I'd expect to see one overlay the other, with the transparency > persisting. > With those two identical white blank images, edit one by adding a > black X, the other by adding a red O, make the white area transparent > in each image, save both, and then combine them - I tried copying > one with either "select all" or "select picture content" - then Paste > into the other. > I tried this with several different color depths, all did the same. STELLARIUM SOFTWARE PNG MAC> But - unless it's something peculiar on my Mac - shouldn't this work? > What I did: > - creating two new images, with /File/New - current GC release - > and saving as GIFs in the format that allows transparency. Thorsten > Yes, thanks, I'll email them from home. Hello, it seems that the Stellarium software requires PNG files with alpha channel. As I mentioned before if I flatten the alpha channel Stellarium sees everything as opaque. The weird thing is the tranparency tool does not active by clicking like normal when viewing the alpha channel. When viewing the alpha channel I have access to the eraser tool and the drawing tool. Not surprising because when I view the alpha channel with GC I can see that I have not removed these pizels (the alpha channel is intact). If I erase pixels and use the transparency tool the png looks transparent in GC and ToyViewer and any other tool except when I load it up in Stellarium. I worked with this most of the day and pretty systematically. I can send an example file if a GC expert wants to take a look and help me. But I cannot get a larger transparency area. I can easily "erase" the pixels of the png file and use the transparncy tool. Stellarium requires the landscape (PNG file(s)) to be transparent above the horizon. I have been trying to use GC to edit a Stellarium (sourceforge planetarium) landscape.
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