I had previously asked for help in voting on some of my bug reports that haddn’t been addressed by the Lindens – some for a few years. One of the bugs was specific to a problem that I was having with PNG textures having white edges, when I expected a black edge to fade into a transparent background.
Through a bit of dialog on the bug report today, I was able to find a way to get rid of this halo effect. The answer was to create a layer that is completely black behind everything. Then, I created a mask for it and painted it with RGB values of 1, 1, 1. This resulted in an almost completely transparent background, but was enough to flip the color information to black instead of white for the transparent pixels.
Peter Stindberg had suggested a plugin from Flaming Pear (Solidify?), and Adeon Writer was also mentioning a plugin (later found out to be liquify). I tried to use both plug-ins, but continued to get some white outlining on some of my black edges around the text before I found a solution with layer masks.
I’m happy that I found a solution after talking with these folks. I understood before hand about the white pixels, but I thought that Adobe Photoshop would handle that on it’s own. I may have to get a copy of GIMP to save PNG images properly. I’m still bothered that there is a semi- transparent black background on my images (although hard to see with the naked eye). At least my products will be looking a bit more crisp and clean.