True, I've also seen this happen with drop shadows in images.even if you thinks its transparent there still maybe something there..
If you have Corel Paint > import your image into CP if you see flashing lines around your image then that is the transparency line that RIP will recognize
If you have Adobe Photoshop > import your image into Adobe Photoshop Elements and you will see the same flashing lines.
Good point.If you have a faded edge or soft edge this can cause a problem with the rip. In multi rip I
I turned off auto white highlight and this got rid of the problem. I had a flame background and kept getting a white edge even with soft under base. Anyway the rip settings were the problem I don't know in fast artist / rip.
You can actually still print the image just fine with these properties applied to them. There is a trick to printing images with soft edges such as gradients fading to transparencies when using FastArtist 1.5.1) They use gradients that fade to transparencies
2) The images have anti-aliasing