G'MIC Chalk It Up

samj · **Joined:** May 09, 2012 **Posts:** 914

Bonjour,

Here is a small G'MIC program to create an effect of chalk.
It's very inspired by the tutorial proposed by Lylejk :clap

http://justpaste.it/chalk_it_up
To test the program to decompress the archive, enter the following command in a terminal : gmic -m Chalk_It_Up_By_Lylejk.txt -Chalk_It_Up
For those who use the archives 64-bit Windows, unzip in .....\gmic_standalone

Image test : Junior Barra http://www.flickr.com/photos/juniorcalou/2460898834/ (licence CC BY-NC-SA 2.0)

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

Very nice!
Thanks Lylejk and samj!

But, How can I add the filter to be used by G'MIC in Gimp? (Linux)

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

Oh yes, samj, please, please, please create your own G'MIC filters source, so I can add it to G'MIC, and everyone could benefit from this chalk filter (and all future filters you will made

).
The only thing missing is the ''#@gimp" comments to describe the plug-in interface to your filters.

Having your own filters source in the plug-in is actually very simple to setup. You need to create a .gmic file hosted in a permanent URL (as you own your web space, this will be super-easy). Look at what Garagecoder (one of the G'MIC filters creator) did it, his file is really clear :

http://s406833247.websitehome.co.uk/gmi ... coder.gmic

You only have to give me the complete URL you chose, and I will add it for all the plug-in users by default.

samj · **Joined:** May 09, 2012 **Posts:** 914

Bonjour,

I'm sorry but I've never been able to create a .gmic file that works...

Rod · **Joined:** May 16, 2010 **Posts:** 14725 **Location:** USA

I am not sure how to use GMIC faves or extra filters in Linux.

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

Here is one template of a .gmic file that should work in your case (with your filter included) :

SHOW SPOILER

As you can see, this is quite easy to understand. Please set correct parameter ranges as I did it quickly. Writing such .gmic file is very interesting because it automatically benefit to a large audience (all plug-in users, via a simple filters update), and is not harder to do than writing a bash script. So I think this is worth doing it :p

lylejk · **Joined:** Sep 24, 2010 **Posts:** 12535

Saved your code to samj.gmic David and placed it in the Roaming folder as are the other .gmic files but the chalkitup preset doesn't show up anywhere. Anyway, cool idea to do it all in gmic. Thanks again to samj for creating the cool script-fu. Love time savers.

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

You need to rename it to 'gmic' only Lyle.

samj · **Joined:** May 09, 2012 **Posts:** 914

Ronounours , :tyspin

Lylejk

The example works perfectly. Here's a screenshot:

lylejk · **Joined:** Sep 24, 2010 **Posts:** 12535

Thanks David; it works . I like the preview ability.

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

I've added a new filters source from Samj in the G'MIC plug-in.
All you need is just to refresh *twice* your filters inside the plug-in, and the Samj's filters should be integrated in the filters tree then (only the Chalk-it-up filters for now on).

More infos here : http://www.flickr.com/groups/gmic/discu ... 155481890/

Thanks again Samj !

lylejk · **Joined:** Sep 24, 2010 **Posts:** 12535

Thanks David; left a message at the G'MIC Flickr. Again, I would like to thank samj too.

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

I love this filter. Thank you all!

By the way, when the image has alpha channel the filter does not work. It should be that way?. That happened to me with the original GimpChat banner.

samj · **Joined:** May 09, 2012 **Posts:** 914

Bonjour,

Version of the filter for GMIC Gimp update.
Correction for images with alpha channel + channel selection

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

Thanks!
One more thing. I have the feeling that by the method of edge detection and colors used, an interesting variant of this filter may be an effect of neon lights (including ability to modify Blur and glare) instead of chalk.
And get things like:

2-ton · **Posted:** Mon Aug 20, 2012 8:45 am **(#16)**

How do we use that update zip? Or can we just refresh our gmic and chalk it up will update to the latest version?

samj · **Joined:** May 09, 2012 **Posts:** 914

@2-ton
Extract and place the file gmic in the directory where other files .gmic are

@YAFU
If you have a method, a tutorial, I can add and create another filter

2-ton · **Posted:** Mon Aug 20, 2012 9:16 am **(#18)**

heh, I use mcgimp, which has gmic already in it, and have no idea where the gmic files are. They do not show up in my file finder.

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

samj wrote:

@YAFU
If you have a method, a tutorial, I can add and create another filter

It is not necessary that filter that I had requested, my mistake.
I was watching the tutorial:
http://justpaste.it/chalk_it_up
And Edge-Detect > Neon filter makes practically everything I wanted

Sorry for not having seen that before!

samj · **Joined:** May 09, 2012 **Posts:** 914

@ 2-ton

If you have version 1.5.1.8 G'MIC for Gimp : viewtopic.php?f=9&t=4982&start=10#p62126
and there is nothing else to do