GNOME Bugzilla – Bug 704304
Stroke Selection is not antialiased
Last modified: 2013-07-16 22:37:25 UTC
Hello, On versions 2.8.4 and 2.8.6, Menu Edit / Stroke Selection is not antialiased when this option is selected in the dialog box. Precisely, it works only on odd values, i.e line will be aliased when values are 3, 5, etc but not 4, 6, etc. Previous discussions tried to demonstrate it was a user misunderstanding, but this is clearly a bug.
Can you provide a link to those discussions?
I see what you mean, however this is not antialiasing. When we stroke a *path* the line goes along a sub-pixel-precision curve and the partially covered pixels get the antialiasing. When we stroke a *selection*, the line always goes along pixel boundaries and an equal amount of pixels left and right of the line get color. For even stroke widths this equal amount happens to be whole pixels, for uneven stroke widths this happens to be some whole pixels and one half pixel. What you are seeing is not antialiasing, you are seeing half pixels being filled. This is not antialiasing but just a blurry outline. Essentially, stroking the selection with an even line width can be used to get an antialiasing-ish effect, maybe this needs to be documented somewhere. *** This bug has been marked as a duplicate of bug 50730 ***
Err with an *odd* line width :)
(In reply to comment #1) > Can you provide a link to those discussions? Yes it's bug 50730 where I made the demonstration with a nice picture. :-)