On Thu, 03 Sep 2009 23:29:37 -0700
Glenn Linderman <[email protected]> wrote:
| convert -size 787x300 xc:white -stroke black -fill white -tile
| pattern:checkerboard -draw "rectangle 0,0 787,300" -threshold 50 rect.tif
|
| produces a strange dark line near the right edge of the image.
|
| One could speculate that it has something to do with the stroke, which
| is otherwise invisible, except that it isn't quite at the end, where the
| stroke should be. I couldn't think of any other speculative reasons, so
| here's this email!
|
Looking closer...
I had to remove the -threshold 50 as it comes out all white otherwise.
Sure you did not means 50%???
Replaceing the threshold and the save to the TIF file replace with....
-rotate 180 -crop 20x20+0+0 -scale 1000% show:
I can see the very slight darkening.
The stroke draws a line just outside the image. You can make that stroke
visioble by doing...
-draw "rectangle 0,0 786,299"
instead. However the very very very slight darkening I will vanish
if I move the rectangle border further away.
-draw "rectangle 0,0 788,301
The default width for stroke is 1 pixel, but it is a floating point
number so it could overflow the pixel boundary very very slightly.
If you don't want this use +anti-alias to turn of aliasing effects.
Also if instead of adjustingthe -draw I add -strokewidth 0.9 before
the draw the slight darkening will also reduce in amount, to where it
is barely noticable unless you look at actual color values.
I would say -strokewidth is slightly too wide. But only very very
slightly, and not really much of a real problem.
If you thing it is a problem, start a topic on the Discussion forum 'Bugs'
section.http://www.imagemagick.org/discourse-server/viewforum.php?f=3
Anthony Thyssen ( System Programmer ) <[email protected]>
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