Stroking very thin lines

Behdad Esfahbod <[email protected]>
Newsgroups gmane.comp.lib.cairo
Message-ID <[email protected]>
Hi,

I'm stroking very thin lines as a way to give them translucency, but I'm
getting very weird results.  I'm stroking red with line-width of 1/30 of a
pixel or so, on a white background.  I expect that I only get shades that are
convex combinations of red and white, but I'm seeing lots of gray instead.
#e8e8e8 even!  See attachment.

behdad

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thin-stroke.png (image/png, 20 KB) - not displayed
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