Hello again!

I have three plugins to share. They are about transformations of Gimp's paths. Nothing remarkable. They are the first step in my current project, and I paused my work to make them into plugins. My long-range aim is to try to make plugins that transform Gimp paths by certain more interesting (conformal) maps.

I know that there are already transformations to deform images. At least G'MIC has a long list. I have not tried those, but it is my guess that they transform images, not paths. But if I am wrong, and if they (or some other existing plugin) can be applied to paths, I hope that somebody tells me so that I shall not work in vain. The problem in transforming a path (for example by a Möbius transformation or such) is different from transforming an image since the input is control points of Bézier curves and the result must again be represented as Bézier curves. Hence, there needs to be an approximation.

Anyway, as a preliminary step I wrote the three plugins. These plugins deal with cases where no approximation is needed, so the results are exact.

Of each of the three plugins I shall soon make a special introductory post. My time is nowadays rather limited, and I think this will take perhaps a week. Here is a quick overview of the plugins:

1. Affine maps. Nothing new here, of course, since Gimp's own transformation tools do affine maps on paths. My plugin gives a different interface: not WYSIWYG, no moving of points on the screen with the mouse, nothing fancy. Very elementary, and the reason why I made the plugin is that I may need affine maps later in my project, and certainly I need similarity maps.

2. Transforming a line figure by a transformation constructed from a Bézier arc. This is new, to me at least. The path to be transformed is what I call a line figure: a path consisting of straight line segments (for example a lattice or a grid). The transformation is in a certain manner constructed from a user-supplied Bézier arc (a path with two anchors). A different arc will give a different transformation. This all I shall explain in detail in a later post.

A3. Deforming a polyline, segment by segment, with a transformation as in number 2. (Actually I call the deforming "curling".) Number 3 is just a variation of number 2.

Of the three I expect number 2 to be the only one interesting. (But then when I ever try to guess what people will find interesting, I go astray. Perhaps I should only say that to me number 2 is the only interesting.) What I myself have in mind is that the code of this plugin will serve as the body where I shall add an approximation algorithm (don't know yet how). Number 1 does nothing new, and number 3 is ..., well, I doubt if it is worth publishing after all, and perhaps it will be removed in later versions.

To get the plugins, go to

http://kmarkku.arkku.net/Path_transforma...aster.html

and scroll down to the bottom. There is a Download button, and it gives you a .zip file containing one file path_transformations.py. Put the .py file in your Gimp's plug-ins folder and restart Gimp. That registers three plugins in your Gimp. They can be invoked in Gimp's Paths tab: right-click the path you want to transform, and at the bottom of the opening window follow

Tools > Transformations > ...

and you will see three plugins to choose from. You can try them right away, but I am going to make explanatory posts of each soon. For the affine maps it will appear today. The rest will follow in a week.

I wonder if there exist a plugin/script that draw an arrow with label on a path ? (for gimp 2.10.18)

Example : 

   

Thank you in advance

I have had a file sent to me, but I am having problems opening it on Gimp. It was originally a PSD file, which I put through a PSD convertor and I saved it as a PNG file. But when I open it, all I get is the front picture, there are no individual files in it? Is there a way around this, or does Gimp have problems reading this sort of file? Thanks.

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source images:
wikimedia
gimp.org

Hey everyone, new here to the forum but have been using Gimp for 17 years (since I was 13)


I hope this is the right place to pose this question.

I had recently stumbled across a Photoshop tutorial (I know, taboo and heretical) but it displays how to create a square image and turn it into a specific style of a circle.

Normally that would be pretty easy, but it's the way the end product looks that I'm having trouble achieving in Gimp even with G'MIC. And it's been driving me crazy.

This is the video, the content I'm speaking on begins at 1:02 and ends at roughly 2:30

I'll attach an image to the sort of final result. It began as a square picture of some clouds that turned into an inward circle and I've been wracking my brain as to how I can achieve that effect in The Gimp.


Can anyone help me with this? Suggestions? Tips? Tutorials? Anything? (Again I'm new so I'm unsure if this is, in fact, the right place to be asking questions regarding tips and techniques inside of The Gimp but it seems to be from the other threads I noticed)

Thank you all so much for your time and help! I have some wild ideas I'd love to try if I can get this circular portal looking shape down.

Warm Regards,
AU:01

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Is there a way to reduce the "physical" size of an image to bring the margins in so that's it the minimum size to show everything?  I am converting stamps and signatures (separately) from CAD to jpeg.  The sheet size i'm using Letter (8.5x11).  I used GIMP's Bimp plugin to to a batch image manipulation on the stamps to bring them all down to approx. 2"x2", but i have 30 or so signatures which all differ in height and length.  I'd like to reduce each signature image from Letter down to as small as possible, getting rid of all the empty white space.

I'm new to GIMP and am using v2.10.18

Greetings folks--
When I cut out something from a picture, say a person, I want to feather the edges so it looks a little more natural.  Does anyone have any idea how to do that?  Currently I am using a path to do the cut, although I would be open to other suggestions.
Thanks in advance for you help.

https://imgur.com/o2ZmCob

https://imgur.com/gP2bXwy

as you can see my quick mask can't select parts of the image properly. Any ideas?

I use GIMP 2.10.18.
I want to export an .xcf file project (for a brochure) so that the content in each layer group is combined onto a single PDF page. That way the entire project will become a multi-page PDF document ready for download and printing from a commercial website.

Using the current functionalities I can only export to a PDF with only the topmost layer-group shown on it.
On GIMP I can hide the topmost layer-group content and then I see the page underneath shown on the main GIMP window. But whenever I try exporting that single page to PDF, all I get is a PDF with the topmost page alone in it.

How should I configure things so that I can get each layer-group to become a single page in a PDF file ?

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A quick jigsaw animation I did with some existing scripts

1. Create a jigsaw pattern apth with ofn-jigsaw
   
2. Edit>Stroke path on a transparent layer (4px width minimum)
   
3. Layer>Transparency>Alpha to selection then discard the layer
   
4. Move to the image layer, and [Delete] t make the jigsaw transparent
   
5. Extract the pieces to layers with ofn-extract-objects
   
6. Add a background, export to animated GIF (all layers to Combine) and serve hot