[gs-bugs] [Bug 578865] Shadings can paint pixels more than once

bugzilla-daemon at ghostscript.com bugzilla-daemon at ghostscript.com
Tue Jun 14 11:35:33 UTC 2011


http://bugs.ghostscript.com/show_bug.cgi?id=578865

Robin Watts <robin.watts at artifex.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|bountiable                  |
         AssignedTo|robin.watts at artifex.com     |michael.vrhel at artifex.com
            Summary|Colors missing in AI9 file. |Shadings can paint pixels
                   |                            |more than once

--- Comment #13 from Robin Watts <robin.watts at artifex.com> 2011-06-14 11:35:31 UTC ---
Changed title from: Colors missing in AI9 file.

The remaining problem with this file, is that when rendered we get various
'stray' lines drawn. These take the form of 'cross hairs' with a circle around
the outside of the radial fill, and occasional speckles on the image itself.

These are due to the fact that shadings do not guarantee to only draw each
pixel once. In particular radial shadings draw the pixels falling on the axes
twice. For solid plotting this does not matter - for transparent rendering it
does.

The solution is probably going to be to setup a knockout group around the
shading if antialiasing is used.

Passing back to Michael, as he's done this before. If the change needs to
happen in the postscript, he may well choose to pass this hot potato onto Alex.

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