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gegl makes a simple starburst
http://gimpchat.com/viewtopic.php?f=9&t=19948		 Page 1 of 1
Author:  contrast_ [ Mon May 30, 2022 10:23 pm ]
Post subject:  gegl makes a simple starburst
I recommend using another open source application called "pixelitor" for making starburst. It has a very high quality starburst filter that is way better then mine.
Neitherless GEGL can now make a simple starburst using my new filter.
Image
https://github.com/LinuxBeaver/gegl-starburst
Author:  contrast_ [ Mon May 30, 2022 10:29 pm ]
Post subject:  Re: gegl makes a simple starburst
Like for real this is my filter GEGL Filter. But there is hope for new filters. A gimp dev I am friends with *may port a anisotropic smoothing filter to GEGL. No guarantees but if it happens I will update the forum. Unlike my filters that just chain existing filters, his filter will require telling GEGL to do actual math.
Author:  Tas_mania [ Tue May 31, 2022 7:39 pm ]
Post subject:  Re: gegl makes a simple starburst
Hi contrast
I'm glad you spent a month or two showing Gimpers how to use GEGL. Some of the effects could be achieved by other methods (like G'MIC). But GEGL is powerful and there is more to come for sure.

With GimpChat there are a lot of views but not so many comments. That means not many active participants at any one time.

Here is a script I made inspired by you that converts an animation folder of PNGs into a neon lights animation.
Code: Select all
#!/bin/bash
mkdir ./done
for i in *.png
do
gegl $i -o ./done/$i -- bloom threshold=2 strength=350 edge-neon radius=1 amount=5 softglow glow-radius=0.1 brightness=0.1
done


Image

The animation started as a Mandelbulber 3D fractal animation.
Author:  contrast_ [ Wed Jun 01, 2022 10:27 pm ]
Post subject:  Re: gegl makes a simple starburst
GEGL Starburst got a major update. It is now based on Kalidescope, (as opposed to polar-coordinates and checkerboard). It has more user friendly options, and is now movable with an on canvas option.


Image
Author:  mahvin [ Thu Jun 02, 2022 9:53 am ]
Post subject:  Re: gegl makes a simple starburst
Sweet! I like this version.

Image
Author:  PixLab [ Thu Jun 02, 2022 8:42 pm ]
Post subject:  Re: gegl makes a simple starburst
contrast_ wrote:
I recommend using another open source application called "pixelitor" for making starburst. It has a very high quality starburst filter that is way better then mine.


And compared to G'MIC (Patterns >> Rays) how does it do?

Anyway, it would be nice if your filter is implemented in GIMP by default :bigthup
Author:  mahvin [ Sat Jun 04, 2022 5:39 pm ]
Post subject:  Re: gegl makes a simple starburst
Version for Gimp-2.10.30 Win 64 bit attached.
In menu: Tools➤GEGL Operation➤Starburst

Place the file in gegl plugins in a directory: C:\Users\<your-user-name>\AppData\Local\gegl-0.4\plug-ins

Attachment:
starburst.zip [37.8 KiB]
Downloaded 44 times
Author:  contrast_ [ Sat Jun 04, 2022 7:30 pm ]
Post subject:  Re: gegl makes a simple starburst
GMIC's starburst can't even change colors correctly.
Pixelitor has the best starburst of anything in FOSS. Mine beats GMIC and comes in second place to Pixelitor.
Author:  mahvin [ Sat Jun 04, 2022 8:20 pm ]
Post subject:  Re: gegl makes a simple starburst
contrast_ wrote:
GMIC's starburst can't even change colors correctly.
Pixelitor has the best starburst of anything in FOSS. Mine beats GMIC and comes in second place to Pixelitor.


There is a starburst generator, online, that cranks out svg files along with png's. Interesting enough, it's easy to crank out a radial burst gear shape using paths to accomplish the same feat. The generator does a good job on making the starbursts, just have the control menus too close to the bottom of the website, making it hard to make selections.
Author:  MareroQ [ Sat Jun 04, 2022 11:22 pm ]
Post subject:  Re: gegl makes a simple starburst
In version 2, I miss the possibility of obtaining small (thin) rays (the same width for the two colors).
Well, that's possible in version 1 - but you can't use them at the same time.

About G'mic:
... "Starburst GMIC cannot even change colors correctly".. - in G'mic Lights & Shadows ➤ Guided Light Rays there is no problem with that when you select a Blend Mode. No problem with that Patterns ➤ Rays.
Author:  contrast_ [ Fri Jul 14, 2023 2:39 pm ]
Post subject:  Re: gegl makes a simple starburst
Starburst updated and it now can remove an original color to only have rays.

Attachment:
starburst_now_transparent.png
starburst_now_transparent.png [ 148.38 KiB | Viewed 1093 times ]



Also, I went out of my way to clarify Starburst code to make it as elegant as possible so people can study and learn from it.
https://github.com/LinuxBeaver/gegl-sta ... tarburst.c


Windows and Linux Binaries here.
https://github.com/LinuxBeaver/gegl-sta ... /Starburst

Directory to Put Binaries (THEY DO NOT GO IN THE NORMAL LOCATION)

Windows
C:\Users\(USERNAME)\AppData\Local\gegl-0.4\plug-ins

Linux
/home/(USERNAME)/.local/share/gegl-0.4/plug-ins

Linux (Flatpak includes Chromebook)
/home/(USERNAME)/.var/app/org.gimp.GIMP/data/gegl-0.4/plug-ins
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