[G'MIC] New filter 'Rendering / Lightning'

Ronounours · **Joined:** Jan 03, 2011 **Posts:** 1656

Hello there,

I've added a new filter Rendering / Lightning in the G'MIC plug-in for GIMP, and maybe it can interest some of you.
It is available after a filter update, it requires at least version 1.6.0.0+ to work properly.
It creates a rendering of a random lightning bold in an image, like in the example below :

Attachment:

gmic_lightning2.jpg [ 136.1 KiB | Viewed 5665 times ]

It is a random process, starting from an initial streak and adding some sub-streaks connected to at least one of existing streaks.
There are plenty of parameters to play with, and you can get some funny results with this filter.
For instance, if you reverse the streak orientations, and play a little bit with the parameters, you can generate things that look like trees :

Attachment:

gmic_lightning3.jpg [ 136.54 KiB | Viewed 5665 times ]

And another example :

Attachment:

gmic_lightning4.jpg [ 172.54 KiB | Viewed 5658 times ]

Well, that's it for now. If you want to test this new filter, just press the 'Filter update' button, and post your trials here

sallyanne · **Posted:** Thu Nov 27, 2014 5:53 am **(#2)**

Cool. Thank you. Will go and check it out straight away!

sallyanne · **Posted:** Thu Nov 27, 2014 8:02 am **(#3)**

This photo is blurred. Will try it on another tomorrow night

pirate541 · **Joined:** May 27, 2011 **Posts:** 707

Thank You Ronounours

The Warrior · **Joined:** Jun 02, 2013 **Posts:** 2075

Very cool.

Marcello · **Joined:** Mar 10, 2014 **Posts:** 845

my trial - the param's are fantastic
THANK YOU :clap

YAFU · **Joined:** Nov 09, 2011 **Posts:** 726

Thank you! fun to play with it

Odinbc · **Posted:** Thu Nov 27, 2014 5:10 pm **(#8)**

Very nice YAFU!
Yours makes it look like it will be most useful for trees.

Rod · **Joined:** May 16, 2010 **Posts:** 14709 **Location:** USA

Nice filter David.

Rod · **Joined:** May 16, 2010 **Posts:** 14709 **Location:** USA

One more.

Settings

Graechan · **Posted:** Thu Nov 27, 2014 6:46 pm **(#11)**

David would it be possible to crop the main bolt after the last branch has forked out

lylejk · **Joined:** Sep 24, 2010 **Posts:** 12516

I wonder if this preset can be coaxed to create Kirlian photography results? Basically, you would input an outline and lightning would radiate outward from the outline. Just curious.

sallyanne · **Posted:** Fri Nov 28, 2014 3:26 am **(#13)**

Is there anyway to make the area around the lightning brighter?
I tried with blurring but not sure that is the way.

Aha! lighting effects helps. This was just done quickly and I know it could be better, but I think this will do it!

Ronounours · **Joined:** Jan 03, 2011 **Posts:** 1656

I've added some new parameters recently, so you can set the lengths of the auxiliary streaks with more flexibility,
and get things like this :

Attachment:

gmic_lightning5.jpg [ 232.25 KiB | Viewed 2655 times ]

There is now a lot of parameters to play with. I hope this is not too much :p

sallyanne · **Posted:** Fri Nov 28, 2014 6:22 am **(#15)**

Thanks

lylejk · **Joined:** Sep 24, 2010 **Posts:** 12516

OK; created this seamless texture using this preset, then I couldn't help myself afterwards. lol

Attachment:

seamless_lightening.png [ 639.09 KiB | Viewed 2641 times ]

https://www.flickr.com/photos/34520999@ ... 3/sizes/o/

sallyanne · **Posted:** Fri Nov 28, 2014 9:08 am **(#17)**

Cool Lyle

lylejk · **Joined:** Sep 24, 2010 **Posts:** 12516

Thanks Sallyanne; still, it would be cool if you could have the lightening follow an outline.

rbdflyboy · **Joined:** Oct 02, 2014 **Posts:** 49

Awhile back created this painted image to represent how a forest fire creates its own weather. Created the cloud to could lightning effect using light filters.

Attachment:

lightning_one.png [ 200.83 KiB | Viewed 2583 times ]

Thanks for this filter, gives me an opportunity to enhance the original.

Attachment:

lightning_two.png [ 264.68 KiB | Viewed 2583 times ]

Needs more work...will be experimenting with the settings some more...thanks again :bigthup

rbdflyboy · **Joined:** Oct 02, 2014 **Posts:** 49

@ Sallyanne...your second image reminds me of times when seeing a power transformer exploding after being struck during a violent thunderstorm..very cool.

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