How to make a circle meander? - Printable Version

How to make a circle meander? - Printable Version

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+--- Thread: How to make a circle meander? (/Thread-How-to-make-a-circle-meander)

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How to make a circle meander? - Bard - 06-23-2018

hello, i want to make this image into a circle, https://imgur.com/d6douAv

that looks like this https://it.depositphotos.com/185081200/stock-illustration-circular-vector-greek-ornament.html

RE: How to make a circle meander? - Blighty - 06-23-2018

I don't know how to make the straight one into a circular one using Gimp. But I woudn't use Gimp for those, I would use Inkscape.

The straight one can be made easily in either Gimp or Inkscape.

For the circular one, I would start from scratch in Inkscape (ie not starting with straight one). Then use Inkscapes's tiled clones.

RE: How to make a circle meander? - rich2005 - 06-23-2018

First Gimp can do this relatively easily, but..always a but.. there will be distortion and a better way might be to re-build the design from scratch.

However.
You do not give the Gimp version, not a real difference between Gimp 2.8 & Gimp 2.10 but the dialogue looks a little different. Using Gimp 2.10

1. Increase the Canvas height to maybe half the width Image -> Canvas Size You can experiment with this the greater the height the more the design is stretched to fit.
screenshot: https://i.imgur.com/gSdfuVG.jpg

2. Now go to Filters -> Distorts -> Polar Co-ordinates Use 100% circle depth / untick Map from top / use To polar https://i.imgur.com/fjDhCqY.jpg Ok that

3. Then crop by hand or Layer -> Autocrop layer gives this: https://i.imgur.com/Q9wTiOE.jpg

RE: How to make a circle meander? - Ofnuts - 06-23-2018

Likely better done with Inkscape, but if you want to do it with Gimp, look at the image the other way, this is image is the composition of:

Three rings of regularly spaced circle arcs
Three rings of regularly spaced radius segments

So likely doable with ofn-path-to-shape and ofn-path-waves.

RE: How to make a circle meander? - Ofnuts - 06-23-2018

(06-23-2018, 01:18 PM)Espermaschine Wrote: There is a tutorial on my blog, but posting links to tutorials is against the rules

Not really. See the rules. I don't see any negative points and several positive ones.

RE: How to make a circle meander? - Bard - 06-24-2018

Thanks for the answers. I followed the instructions and it end up looking like this lol
https://imgur.com/N9ENg7v

I don't know about inkscape but i'll keep Meander-PaP.svg so thank you.

RE: How to make a circle meander? - rich2005 - 06-24-2018

With due respect, did you you follow exactly? My guess is your pattern is not the same as the image you referenced. It has space either side.
Of course that space is included when the filter is applied
example before: https://i.imgur.com/FHACdhc.jpg
example after: https://i.imgur.com/ehPv8Ji.jpg

but then Meander-MAP.svg is a vector image produced by applications such as Inkscape. You can import that into Gimp 2 ways, The usual open as an image where you are given choices for size & resolution but then it is a raster (bitmap) image, not exactly set in stone but not scalable without distortion.
or
It might import OK as a path see: https://docs.gimp.org/en/gimp-path-dialog.html which you can scale/to any size without distortion, but then you need to Edit -> Stroke Path to fix as a bitmap onto a layer

RE: How to make a circle meander? - Espermaschine - 06-24-2018

With rich's Polar Transform method i get much better results when i upscale the image height by a factor of two before the transform. Then add a bit of sharpening and it comes out quite nice.
Probably a special case because of the b/w and the blocky design.

[attachment=1862]

RE: How to make a circle meander? - Ofnuts - 06-24-2018

OK, I won't say that was easy, but a combination of my following scripts

dial-marks: generate the three levels of circle arcs
ofn-path-edits: delete the extra strokes in the dial marks, and splice the final result into one single path
ofn-path-to-shape: generate spokes, and cut them at the right places

And, lo and behold:

[attachment=1863]

With the SVG:

[attachment=1864]

RE: How to make a circle meander? - Bard - 06-25-2018

Thanks guys i manage to do it like this now. But now i have another problem, colorise doesn't work. it doesn't color the white space only the edges.
https://imgur.com/a/RUdIIUA