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Paint/Fill Antialiased Areas of PNG?

Oct 26, 2010, 10:14
Post: #1
Paint/Fill Antialiased Areas of PNG?
I've used GIMP to great effect for quite a while now but I know I'm taking the long way around on a lot of things because I'm not very savvy on CG stuff, so I thought I'd ask here. I actually was registered with Gimptalk but it appears to be gone? Anyway...

I am currently making my own 'original artwork' by using usually open source/public domain photos and such, and using transparent layers to "draw" lines over them, making my own lineart. My problem is that I can't seen to find a "turn antialising off" checkbox in GIMP.

Even if I did, I do some postprocessing in Inkscape to turn the lineart into something more smooth, and then it re-antialiases (is that even a word) the picture, and when I try to use the paintbucket to fill in the lineart to get simple color pictures, I get lots of white specks and dots from the antialiased edges of the smooth lines.

What do I need to do to a picture to make sure I can fill spaces with a color right up to the lines, AFTER it has been antialiased, in my example? I can't use duotone or index to 2bit color or whatever, because that bites chunks out of the black lines and also destroys the smoothness of the Inkscape processing, but even if I haven't used that, it still reduces the lines spottily.

I've tried turning the tolerance way up and filling the areas with white first, hoping the white and the near-white specks will be close enough to "bleed" together so I have one color, and then paint with the desired color, but it still has specks.

What am I doing wrong?

Also any other better ideas for doing lineart to achieve the same results I'm trying to achieve, that would be easier, would be great. I'm hand-tracing over the lines by eye, which, though I'm good at it and it doesn't take long, is more time consuming than it probably should be, and tedious.

Thanks for any ideas!


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May 2, 2012, 09:59
Post: #2
RE: Paint/Fill Antialiased Areas of PNG?
Thank you for your reply, but it is not quite what I'm looking for - I can't seem to find a way to avoid or include the smaller detail lines and I still have been unable to find a good, consistent way to do this. If anyone could please help me, I would very much appreciate.


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May 2, 2012, 11:53
Post: #3
RE: Paint/Fill Antialiased Areas of PNG?
@jpneok

Quote:Thank you for your reply, but it is not quite what I'm looking for - I can't seem to find a way to avoid or include the smaller detail lines and I still have been unable to find a good, consistent way to do this. If anyone could please help me, I would very much appreciate.

Rather than Inkscape you could try using potrace command line to create an svg file then import into Gimp. You get lots of paths, just select the ones you need.

Something like http://i.imgur.com/E0zfP.jpg

I did a how-to very recently, might/might-not help http://youtu.be/bhHACVo_pKE

If using linux or have access to a linux machine then there is an old graphics utility called SVGpage. This uses autotrace rather than potrace and again produces lots of paths, make visible the ones you want then merge and save.

example, and stroked the merged path. http://i.imgur.com/dqbzZ.jpg

and a bit about it here: http://www.gimphelp.org/svgpage_download.shtml

** https://www.gimp-forum.net/ now answering questions**
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May 5, 2012, 21:53
Post: #4
RE: Paint/Fill Antialiased Areas of PNG?
Those are great answers, and I appreciate the quick response. I'm going to look over all this info. I usually hand-trace over a real-world image on a new layer in GIMP to get line art, then have been using Inkscape to trace bitmap to get a smoother image, but I tend to just use the LINE tool in GIMP so even in Inkscape, my stuff still comes out looking too sharp in places.
Thank you very much to everyone for their help, I'm excited to try this all out! -JP
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