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 Post subject: G'MIC'd Cat - A Quick Tutorial
PostPosted: Thu Jul 29, 2010 3:19 pm  (#1) 
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In answer to PhotoMaster's request here about ways to use G'MIC.

PhotoComix is the G'MIC expert but I'm willing to share what I did.

Original cat image here.

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First after opening your image, duplicate it and close the original.

I duplicate the image layer a few times and turn off all but the top two. It's good to have at least one in reserve.

My first pass in G'MIC on the cat I used Artistic > B&W Pencil. I only lowered the Amplitude a little while keeping an eye on the fur on the tail. When I got something I liked I clicked OK. I set the layer to Value mode I think and merged it down and duplicated that layer.

On the top layer I went to Artistic > B&W Sketch and I think I just changed the Stroke length a little and clicked OK. I set that layer mode to Burn, but browse through the modes until you get something you like. Merge that layer down. Don't duplicate.

Last I went to Presets > Thin brush smoothing, and the only two things I changed were Amplitude and sharpness.

Then I used the paths tool to select both of the eyes. You can select around one eye, then hold down the Shift key and click a new path node on the other eye, let up on the Shift key and continue selecting around the second eye. Press enter to start the marching ants, press B to get rid of the path nodes.

Color > Hue & Saturation. I selected yellow in the color to adjust and slid the hue bar so that the yellow changed to a greenish yellow. Then I increased the lightness and saturation until I got what I wanted.

Hope that helps a little.

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 Post subject: Re: GMIC'd Cat - A Quick Tutorial
PostPosted: Thu Jul 29, 2010 6:04 pm  (#2) 
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Very nice "O" has my Benji's face but not body. lol

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 Post subject: Re: GMIC'd Cat - A Quick Tutorial
PostPosted: Thu Jul 29, 2010 6:09 pm  (#3) 
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Thank you, Molly.

This is the article the cat picture was in. The picture is of a Near Eastern wildcat which is the domestic cat's nearest relative. I found the article very interesting.

http://www.dailymail.co.uk/news/article-464985/Mother-cats-lived-Mesopotamia--130-000-years-ago.html

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 Post subject: Re: GMIC'd Cat - A Quick Tutorial
PostPosted: Thu Jul 29, 2010 7:05 pm  (#4) 
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:coolthup i think is very clear.

About the Sketch filter here there are good tip http://www.mediafire.com/file/7zcil4tndkhr17k/How

In his tut Tom doesn't use a pencil layer but layermasks , 3 luminosity masks( for shadows middletones highlight ) each for a different sketch layer, to combine in darken only mode


I am tempted to use this script http://gimpfx-foundry.sourceforge.net/b ... xtract.scm to get a different kind of layermask ...Layermask based on the diffferent channels should be good base to create masks for speciphic objects (as blue sky, green leaves, red fruits... ) :cofscreen

But the Sketch filter on my PC has a painfully slow preview and that make a pain experiments different settings and a similar approach will multipy the time :gaah

I am just thinking load:...simple things usually work better and that simple but intuitive combination of Gmic effect layers on the original you show in this tut works well and straight

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Last edited by PhotoComix on Thu Jul 29, 2010 7:39 pm, edited 2 times in total.

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 Post subject: Re: GMIC'd Cat - A Quick Tutorial
PostPosted: Thu Jul 29, 2010 7:24 pm  (#5) 
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PhotoComix wrote:
:coolthup i think is very clear.

I want try to use this script http://gimpfx-foundry.sourceforge.net/b ... xtract.scm to get a different kind of layermask ...Layermask based on the diffferent channels should be good base to create masks for speciphic objects (as blue sky, green leaves, red fruits... )
Thank you.

Is there a link that shows anything about that layermask script like results or instructions? I just get the script when I download it.

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 Post subject: Re: GMIC'd Cat - A Quick Tutorial
PostPosted: Thu Jul 29, 2010 7:58 pm  (#6) 
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The script doesn't create layermasks but decompose the imagine in all possible channels (,so not only RGB but also CMYK, LAB, HSV)
Each channel become a new layer (the original remain at the bottom )

You may expore them just by toggling off visibility one by one....The first 2 layers you will see will be very delusive but don't give up, look the others


To narrow the result CYMK and RGB are both work a look as base for possible masks .. a bit less the V and L channels,
...much less the others

But then copy the layers and paste as layermasks has to be done manually and is a bit boring (This stirs something in my memory...maybe Saulgoode wrote a script to quickly paste layermask ? .. )

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 Post subject: Re: GMIC'd Cat - A Quick Tutorial
PostPosted: Thu Jul 29, 2010 8:18 pm  (#7) 
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Yes.
Here are the two I have
sg-copy-mask.scm - this one copies a mask to all visible layers.
sg-apply-masks.scm - this one applies all masks to layers

You can get them here: http://chiselapp.com/user/saulgoode/repository/script-fu/home

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 Post subject: Re: GMIC'd Cat - A Quick Tutorial
PostPosted: Thu Jul 29, 2010 9:14 pm  (#8) 
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Nice tutorial, ill have to dive more into GMIC.I do not use it too often, but their are sooo many filters there...lol =)

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 Post subject: Re: GMIC'd Cat - A Quick Tutorial
PostPosted: Thu Jul 29, 2010 9:31 pm  (#9) 
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I ran the lasm filter on the original cat image. It ended up with 14 masks.

I copied the image so that I had 14 and moved each layer up under a mask.

Then I used the copy mask to layers and each time I had only one layer visible (the one below the mask) to copy the mask to.

I've attached the zipped file.


Attachments:
cat-lasmfilter.xcf.zip [22.66 MiB]
Downloaded 477 times

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 Post subject: Re: GMIC'd Cat - A Quick Tutorial
PostPosted: Sat Jul 31, 2010 10:23 am  (#10) 
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weird ....i was sure to have posted a reply here

i did forget about the xcf with the cat , i am downloading just now
maybe the cat was not the most adapt for similar mask:
i think more useful when there are object of different color to masks

PS how the Gmic Sketch filter works on your machine ? on my is really slow for updating the preview

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 Post subject: Re: GMIC'd Cat - A Quick Tutorial
PostPosted: Sat Jul 31, 2010 10:44 am  (#11) 
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PhotoComix wrote:
weird ....i was sure to have posted a reply here
You did, in the release announcement about G'MIC 1.3.9.0 here.

PhotoComix wrote:
PS how the Gmic Sketch filter works on your machine ? on my is really slow for updating the preview
It takes little awhile to update - a few seconds. Depends on the size of the image.

PhotoComix wrote:
About the Sketch filter here there are good tip http://www.mediafire.com/file/7zcil4tndkhr17k
AFAIC, I like your image results much better than that one. It's rather plain-looking to me.

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 Post subject: Re: GMIC'd Cat - A Quick Tutorial
PostPosted: Sat Jul 31, 2010 12:20 pm  (#12) 
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I found that add add a BW pencil layer give more depth and simulteneasly make more clean and clear the sketch

But the use of the masks is intriguing
As example to merge different knind of stoke and fill for highlight midtone and shadow or for different objects )

But really took me too time adjust the parameters and wait the preview, i should try with smaller images.

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