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Lithophane/line image

Sep 15, 2014, 11:09
Post: #1
Lithophane/line image
Hi,

I have been using gimp for a couple of months now, but there is something I really want to know how to do. I am a little bit unsure of what you call it but I have attached an image of what it is I am after. Essentially it is a series of lines that change depending on the brightness of the original image. I want to start off by doing straight lines, but I wouldn't mind playing with a circular effect or waves. I have tried gimppressionist, but I couldn't get it to do what I wanted, I also tried an overlayed layer, and use some of the layer modes, but I couldn't get either to work.


[Image: Grooves_1.jpg]


Many Thanks

Dave
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Sep 15, 2014, 11:59 (This post was last modified: Sep 15, 2014 12:11 by rich2005.)
Post: #2
RE: Lithophane/line image
I would start off with this thread from GimpChat

http://www.gimpchat.com/viewtopic.php?f=...lit=dither

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Sep 16, 2014, 12:46
Post: #3
RE: Lithophane/line image
Thanks, the news print option looks like it does something similar with the news print option. As it looks the easier option. I would want to do circular ones too, but it doesn't look like that's possible.

Thanks

Dave


(Sep 15, 2014 11:59)rich2005 Wrote:  I would start off with this thread from GimpChat

http://www.gimpchat.com/viewtopic.php?f=...lit=dither
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Sep 16, 2014, 14:06
Post: #4
RE: Lithophane/line image
I do have a bit of an idea of another way of doing it, but not entirely sure how to go about it.
What I am thinking of doing is convert to B/W, then posturise to 15. Add another layer with the pattern I want, for example a load of black circles, all concentric with equal line widths and gaps, and subtract this from the original image. then select all of one gradient (one of the 15) and shrink (or grow) the selection by say 1 pixel at a time, copy to a new layer, fill the selection with full black, (just have to watch that I don't get gaps with the shrinking). The only problem is that this might take some time, it might make the areas a bit funny where one size meets another, but I am not sure. The image might need to be scaled first, and blurred to ensure that the final image is smooth. Unless there is a way of scaling and applying a blur that smooths the edges, without effecting the brightness. maybe an edge detect will do it. Although I could vectorise in ink-scape to give the same effect. Or even use it for the image growing/shrinking bit, but I know ink-scape well and I am trying to learn gimp.
What do you think?

Dave
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