Smoothing inked lines?
Forums ► For GIMP users ► Smoothing inked lines?
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Marc Carson
(over 1 year ago)
- Noel Stoutenburg (over 1 year ago)
-
mac9416
(over 1 year ago)
- Marc Carson (over 1 year ago)
- David Gowers (over 1 year ago)
-
bktheman34
(over 1 year ago)
- Marc Carson (over 1 year ago)
Sent: 2010-07-14 22:35:21 UTC (over 1 year ago)
Smoothing inked lines?
I've been scanning inks into GIMP, then moving them over to Inkscape for
tracing to make the lines smoother. Is there a way to do this in GIMP alone?
I don't mean vector tracing, just getting rid of the smaller abnormalities
or fuzziness around my inked lines. I already scan at 600 dpi.Here's an example:
http://www.friendlyskies.net/projects/comics/before-after.pngThanks!
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Sent: 2010-07-14 22:53:27 UTC (over 1 year ago)
Smoothing inked lines?
Marc Carson wrote:
> I've been scanning inks into GIMP, then moving them over to Inkscape for
> tracing to make the lines smoother. Is there a way to do this in GIMP
> alone? I don't mean vector tracing, just getting rid of the smaller
> abnormalities or fuzziness around my inked lines. I already scan at 600 dpi.I expect there are; what have you tried? One of the first that comes to
my mind is the unsharp mask (found in 2.6 under Filters > enhance?_______________________________________________
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Sent: 2010-07-14 22:56:17 UTC (over 1 year ago)
Smoothing inked lines?
This is something I've struggled with as well. I'm not sure if I've
ever found a good solution, but Selective Gaussian blur comes to
mind. It's in Filters > Blur > Selective Gaussian Blur. Just tinker
with the settings and see what happens.Is there somewhere we can see one of the scans you're working with?
On Wed, Jul 14, 2010 at 3:35 PM, Marc Carson wrote:
> I've been scanning inks into GIMP, then moving them over to Inkscape for
> tracing to make the lines smoother. Is there a way to do this in GIMP alone?
> I don't mean vector tracing, just getting rid of the smaller abnormalities
> or fuzziness around my inked lines. I already scan at 600 dpi.
> Here's an example:
> http://www.friendlyskies.net/projects/comics/before-after.png
> Thanks!
>_______________________________________________
> Gimp-user mailing list
> Gimp-user@lists.XCF.Berkeley.EDU
> https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
>
>
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Sent: 2010-07-14 23:09:01 UTC (over 1 year ago)
Smoothing inked lines?
>
> Is there somewhere we can see one of the scans you're working with?
>Sure. Here's an original panel straight from the scanner:
http://friendlyskies.net/projects/comics/originalpanel.pngI tried unsharp mask and selective gaussian blur, but no luck either way
(converted to RGB)._______________________________________________
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Sent: 2010-07-14 23:35:41 UTC (over 1 year ago)
Smoothing inked lines?
OK, try this: apply a Gaussian Blur to the image (I used it at 7 or 8
pixels) to smooth those lines up, and then apply a Unsharp Mask to
sharpen it again. You should end up with fairly smooth lines. You can,
of course, tinker with the settings of both filters to fine-tune the
result.On Wed, Jul 14, 2010 at 4:09 PM, Marc Carson wrote:
>> Is there somewhere we can see one of the scans you're working with?
>
> Sure. Here's an original panel straight from the scanner:
> http://friendlyskies.net/projects/comics/originalpanel.png
> I tried unsharp mask and selective gaussian blur, but no luck either way
> (converted to RGB).
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>
>
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Sent: 2010-07-15 00:28:25 UTC (over 1 year ago)
Smoothing inked lines?
Hi,
marc@marccarson.com (2010-07-14 at 1409.01 -0700):
> > Is there somewhere we can see one of the scans you're working with?
> Sure. Here's an original panel straight from the scanner:
> http://friendlyskies.net/projects/comics/originalpanel.png
> I tried unsharp mask and selective gaussian blur, but no luck either way
> (converted to RGB).Pretty old tech and that works in greyscale: gaussian blur (different
scans, different values, try 5-15 for your png) followed by curves
with a sigmoid shape (make flat zones both at start and end with a
sharp / in the middle, for your png start with with 3 squares flat at
min, then 2 for the climb, and 3 at max).At worst case, mask the plants and apply different settings: big blur
in the plants destroys them, and small blur keeps lots of noise in
the car lines.GSR
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Sent: 2010-07-15 01:53:06 UTC (over 1 year ago)
Smoothing inked lines?
On Thu, Jul 15, 2010 at 6:05 AM, Marc Carson wrote:
> I've been scanning inks into GIMP, then moving them over to Inkscape for
> tracing to make the lines smoother. Is there a way to do this in GIMP alone?
> I don't mean vector tracing, just getting rid of the smaller abnormalities
> or fuzziness around my inked lines. I already scan at 600 dpi.
> Here's an example:
> http://www.friendlyskies.net/projects/comics/before-after.png
> Thanks!Yes, you may want a combination of
1. Despeckle (to eliminate specks)
2. GMIC Anisotropic Smoothing (GMIC plugin: gmic.sf.net)
with a relatively large radius, large tensor-smoothing value, and
anisotropy = 1.0. Experiment with different values of 'sharpness' --
you may need to reduce it below the default 0.70 to get as much
smoothing as you want.Another solution:
If you are running linux, you will probably have the tools to make a
batch-processing script or Python GIMP plugin that uses PoTrace
(commandline tool;same algorithym as is integrated into Inkscape).
Potrace has options to output a PGM (ie a greyscale raster, rather
than a vector -- like SVG etc) to do tracing/smoothing.
This could be the fastest and most reliable, high quality option, once
you have worked out the options appropriate for your work.The most important options for Potrace would probably be
--alphamax #how smooth the output is. 0..1.43, default 1.0.
--blacklevel #the black/white threshold -- in the range 0..1.
--turdsize #this discards junk pixels -- pixel islands of N size
--pgm #set output format to PGM raster, or..
--svg #you could get an SVG -- if you wanted a larger output than input.
--width
--height # set output dimensionsHope one of those suggestions help. :)
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Sent: 2010-07-16 11:46:53 UTC (over 1 year ago)
Smoothing inked lines?
Here's what I'd do. Gaussian blur, by 8 pixels radius. Then do COLOURS >
BRIGHTNESS-CONTRAST, increase the contrast slider to 70.--
Bill (via www.gimpusers.com)
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Sent: 2010-07-21 02:00:33 UTC (over 1 year ago)
Smoothing inked lines?
> Here's what I'd do. Gaussian blur, by 8 pixels radius. Then do COLOURS >
> BRIGHTNESS-CONTRAST, increase the contrast slider to 70.
>Thanks for that (and everyone else for the other great ideas). I'm using
this trick for now until I get a direct potrace solution working. I also
noticed that G'MIC has a "XSmooth Comic Lines" or something like
that...sounded awesome but I wasn't able to get a good result from it. Maybe
it's for a different purpose. Too many sliders to tell... :-)_______________________________________________
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