How can I get rid of strange single-pixel lines inside table borders or between table cells in Adobe Acrobat?
Since Apache FOP supports the collapsed border model, every border segment consists of two separate shapes. This is due to the fact that each side of the border segment can have a different color. Now, Adobe Acrobat may display thin (1 pixel wide) lines inside the border segment or sometimes even between to adjacent colored rectangles making up the background of a block or table cell. This effect is due to the way Adobe Acrobat does anti-aliasing. Adobe’s algorithm seems to cause these artifacts. Other PDF viewers don’t have that problem. Or at least we haven’t had any reports in that direction. First of all, these artifacts do not appear in print since no anti-aliasing is done by Adobe Acrobat in this case (except maybe if you tell Acrobat to print the page as a bitmap in which case Adobe fully composes the page itself). So, if the artifacts appear on screen, it doesn’t mean they have to appear in print, too. To get rid of the artifacts, you can call up the “Preferences” dialog of Ado
