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 Post subject: Faking PS Fibers Using GIMP
PostPosted: Sun Feb 20, 2011 8:41 am  (#1) 
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I found this tutorial here:

http://www.chainstyle.com/tutorials/fibers.html

I usually copy and paste older tutorials like these into my google notebook, for the concern they may not exist tomorrow. Anyway, I just substituted GIMP Ripples for PS Waves, and faked the settings (tinkered until the results were similar). Don't expect your results to be identical to the author's because of the way your difference clouds turn out.

What would this be used for? Water effects, mostly. With the right Curves settings applied, you can give it a molten metal look and apply a radial blur for a brushed metal look.

I thought I would share this after searching for alternatives for converting a PS tutorial to GIMP.
Image

The GIMP Translation:

1. Open a square image (equal width & height - any size) with a white background.
2. Go to Filters - Render - Clouds - Difference Clouds and apply these settings:
Image

3. Select the Blend Tool and use the following settings (there is no right or wrong here - your effect will just appear slightly different than mine and the example in the web tutorial, so don't worry if your example differs than the one shown here):
Image

Using the Blend tool with default black and white colors, mode set to Difference, shape = Bi-linear, follow a similar lay-out of the red arrows, until you get a similar (not perfect) result:
Image

4. Go to Filters - Distorts - Ripples and apply the following settings:
Image

5. Go to Layer - Transform - Rotate 90 degrees clockwise.

6. It was at this point I needed to decide how "fibrous" I wanted my fibers to be. Did I want them to be bristly (coarse) or cottony (smooth). You, too, need to decide which way you want your fibers to look. If you want coarse:

6a: Apply Filters - Artistic - Cubism:
Image

Then apply Unsharp Mask:
Image

6b. If you want smooth fibers, apply a Gaussian blur of 5px, then apply the Unsharp Mask settings you see above.

I went the coarse route, so my fibers look like this, at this point:
Image

7. The next step involves Filters - Distorts - Wind at the following settings twice (once for each direction):
Image

8. Now Filters - Blur - Motion Blur:
Image

9. Now a little darkening is needed. We do that by applying Colors - Levels :
Image

10. Then a final Ripples effect - Filters - Distorts - Ripple:
Image

11. And now crop the outer edge, but maintain a square image. Using the Crop tool, I set my crop area to 455 x 455px, then click the image. You're done! :)
Image

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Last edited by mahvin on Sun Feb 20, 2011 10:34 pm, edited 1 time in total.

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 Post subject: Re: Faking PS Fibers Using GIMP
PostPosted: Sun Feb 20, 2011 9:12 am  (#2) 
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I'm just going to have to play with that tutorial some more. I like the results. I could see using it for watery stuff and also for hair on a cartoon character.

I used your render, mahvin, for this so I wouldn't have to go through all the beginning steps. I set a white layer to Overlay on it to lighten it. I used Noise > Slur and played with the settings (GIMP's Wind filter is not like PS's). After I processed it in slur the results left transparent areas at the top so I duplicated and flipped a layer vertically to fill in the gaps. The blue is from a new layer set to Overlay. I could see this as a flowing river.

Image

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 Post subject: Re: Faking PS Fibers Using GIMP
PostPosted: Sun Feb 20, 2011 11:10 am  (#3) 
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Aw man, I'm not coming up with those great ripples you did, mahvin. I wanted mine shorter.

This one, I did a pixel stretch from a desaturated plasma set to the highest value on the plasma. Then I did unsharp mask on the stretched pixel results. G'MIC and did Cartesian transform in the Deformations menu, with all of the values set to 70 (after you set the values you have to uncheck relative warping and recheck it to get the values to work).

Image

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 Post subject: Re: Faking PS Fibers Using GIMP
PostPosted: Sun Feb 20, 2011 3:53 pm  (#4) 
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I'll convert the tutorial to GIMP, and explain my settings. I found the technique very useful and made some patterns from the results, so I believe it can be useful for others.

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 Post subject: Re: Faking PS Fibers Using GIMP
PostPosted: Sun Feb 20, 2011 10:34 pm  (#5) 
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The tutorial is up. See first post.

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 Post subject: Re: Faking PS Fibers Using GIMP
PostPosted: Sun Feb 20, 2011 10:59 pm  (#6) 
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sort of looks like sepia tone wavey hair, I did play around with colorize and layer modes
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 Post subject: Re: Faking PS Fibers Using GIMP
PostPosted: Sun Feb 20, 2011 11:32 pm  (#7) 
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Yeah, you can get real wacky with it, and even throw some G'MIC presets at it. I am using it to mimic water/waves coming in to shore.

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 Post subject: Re: Faking PS Fibers Using GIMP
PostPosted: Mon Feb 21, 2011 1:30 am  (#8) 
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Makes a cool looking desert! :)
Sorry Mahvin i snatched your render too. :lol
I think i may just save this one as a tillable pattern.

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 Post subject: Re: Faking PS Fibers Using GIMP
PostPosted: Mon Feb 21, 2011 1:36 am  (#9) 
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It sure does, Rod. :)

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 Post subject: Re: Faking PS Fibers Using GIMP
PostPosted: Thu Jun 02, 2011 5:49 am  (#10) 
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I've found a better and easier way to fake fibers thanks to a tutorial I was reading on Gimpusers:

http://www.gimpusers.com/tutorials/generating-stripes

It's much simpler than all that info I posted at the beginning of this thread.

Open an image and run solid noise on it with these settings:
Image

Then add a bit of ripple (not too much):
Image

Then duplicate the result, scale the top layer and reduce the height (only) by about 75%:
Image

Then horizontally flip the result to the top layer. Set the top layer mode to lighten only (or use a layer mode that works best for you.

Right click and set the top layer to image size.

Use the smudge tool to fray the ends of the bottom fibers of the top layer:

Image

Run ripple on the top layer and slightly alter it by adjusting the phase option.

The result:
Image

Please note that due to the randomness of using randomize and make tileable, your result will not look exactly like mine.

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 Post subject: Re: Faking PS Fibers Using GIMP
PostPosted: Thu Jun 02, 2011 7:01 am  (#11) 
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Cool, looks sort of like llama fur!


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 Post subject: Re: Faking PS Fibers Using GIMP
PostPosted: Thu Jun 02, 2011 1:11 pm  (#12) 
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 Post subject: Re: Faking PS Fibers Using GIMP
PostPosted: Thu Jun 02, 2011 4:05 pm  (#13) 
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ok well here is my result from the first one which I colourized.


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 Post subject: Re: Faking PS Fibers Using GIMP
PostPosted: Thu Jun 02, 2011 8:28 pm  (#14) 
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Here is my attempt too. :) I tried several things to get these results.

Liana


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blondehair.png
blondehair.png [ 75.42 KiB | Viewed 2036 times ]
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 Post subject: Re: Faking PS Fibers Using GIMP
PostPosted: Thu Jun 02, 2011 8:35 pm  (#15) 
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All good results. :)

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 Post subject: Re: Faking PS Fibers Using GIMP
PostPosted: Thu Jun 02, 2011 9:05 pm  (#16) 
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[quote="mahvin"]I've found a better and easier way to fake fibers thanks to a tutorial I was reading on Gimpusers:

http://www.gimpusers.com/tutorials/generating-stripes

It's much simpler than all that info I posted at the beginning of this thread....
[quote]

Used this tut as the basis for my result (and of course it's seamless). Additional trick is G'MIC's Isophotes along with a cool plugin called Intelligum (vertical only). Pretty cool Mahvin. :)


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ffibers.png
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 Post subject: Re: Faking PS Fibers Using GIMP
PostPosted: Thu Jun 02, 2011 9:20 pm  (#17) 
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I call this one Fake Blond Hair. Left transparent background (Isophotes). It's seamless too. :)


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