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Photo Retouching "Improving" photos, post-production, correction, etc.

this frequency separation you all speak of...

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  #1  
Old 06-16-2011, 07:45 AM
P_fuzz P_fuzz is offline
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this frequency separation you all speak of...

show me the way to it

j/k, I was wondering if there is an ultimate tutorial on this tech, so far I only found some really poor elaborated ones on youtube.

thanks
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Old 06-16-2011, 07:47 AM
P_fuzz P_fuzz is offline
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Re: this frequency separation you all speak of...

and btw, how does it set itself appart (as a technique) from, say, DnB?
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Old 06-16-2011, 08:00 AM
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Chain Chain is offline
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Re: this frequency separation you all speak of...

Frequency separation is a technique that accomplishes something different than d&b.

I recently covered it in this post; http://www.retouchpro.com/forums/pho...tml#post292871

Here are my actions so you can try and see how it works:
http://www.retouchpro.com/forums/att...1&d=1307869520

-- (copy from thread) --

Frequency separation basically turns your image into two layers. At the bottom is a layer containing the low frequency details (basically a blurred version of the image), and above that is a layer that contains the high frequency details (the "difference" between the blurred layer and the original). Blended together they should be identical to the original (slight differences might occur due to rounding errors and such).

This allows you to edit the two components separately. You can clone/heal fine details like pores without affecting the general shades in an area, or the other way around.

You can also decide to blur away medium size details afterwards on the underlying (low frequency) layer (probably best to do this on a duplicate layer not on full opacity, and with a mask). This can be called "Band Stop" as it removes a band of frequencies. Can be a great help when fighting "blotchy" skin.

You do not have to use Gaussian Blur (although this is the most common). You could use Surface Blur, Dust & Scratches, Lens Blur, or other filters as a base for the separation.

Last edited by Chain; 06-16-2011 at 08:14 AM.
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Old 06-16-2011, 08:01 AM
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Der_W Der_W is offline
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Re: this frequency separation you all speak of...

The ultimate post about FS: https://www.modelmayhem.com/po.php?t...=439098&page=1

As to your second question: It's a whole different thing. D&B is used to selectively lighten or darken pixels. FS is used to separate your image into different levels of detail on which you can work individually without having to worry about the other levels.

Edit: The other Jonas was faster :-)!
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Old 06-16-2011, 08:10 AM
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Chain Chain is offline
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Re: this frequency separation you all speak of...

Step by step if you want to try it manually (it is a bit cumbersome and I usually forget the Apply Image settings, that's why I use actions for it):

(assuming flat image)
1. Duplicate background twice. Call the bottom one LF, and top HF. (Hide Background as a backup).
2. Blur the LF layer until the finest details (those you want to separate out) just disappears. Maybe something like 2-10 px depending on the image.
3. Select the HF layer, and choose Image > Apply Image
4. Choose these settings for 8-bit images:
Layer: LF
Blending: Subtract.
Scale: 2
Offset: 128
Preserve Transparency, Mask, and Invert should not be checked.
5. Set the blending mode of the HF layer to Linear Light (100%).

The result (of the LF + HF layers) now looks identical to the original image. You can work on them separately (e.g. try blurring or airbrushing away unwanted shades on the LF layer). Works nice for straightening out fabric as well, not only skin tones.

For 16 bit images, apply image should have these settings:
Layer: LF
Blending: Add
Invert: Checked/yes
Scale: 2
Offset: 0
Preserve Transparency and Mask should not be checked.

Last edited by Chain; 06-16-2011 at 03:12 PM. Reason: Did another little mistake... :)
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Old 06-16-2011, 08:19 AM
P_fuzz P_fuzz is offline
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Re: this frequency separation you all speak of...

Yay, that was some quick response.

@Chain, I will try your action out, thank you.
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Old 06-16-2011, 08:56 AM
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Re: this frequency separation you all speak of...

PS: the actions work fine on layered documents.
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Old 06-16-2011, 09:13 AM
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Der_W Der_W is offline
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Re: this frequency separation you all speak of...

Quote:
Originally Posted by Chain View Post
For 16 bit images, apply image should have these settings:
Layer: LF
Blending: Add
Invert: Checked/yes
Scale: 2
Offset: 9
Preserve Transparency and Mask should not be checked.
Offset should be 0, not 9 ;-).
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Old 06-16-2011, 09:44 AM
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Godmother Godmother is offline
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Re: this frequency separation you all speak of...

maybe this helps http://nataliataffarel.tumblr.com/po...ng-and-cloning
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  #10  
Old 06-16-2011, 11:49 AM
lunaxxxxxx lunaxxxxxx is offline
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Re: this frequency separation you all speak of...

but whats it all about that FS...?
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