Go Back   RetouchPRO > Technique > Photo Retouching
Register Blogs FAQ Site Nav Search Today's Posts Mark Forums Read

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

frequency separation-questions?

Thread Tools
Old 10-08-2010, 02:43 AM
bilguitei bilguitei is offline
Junior Member
Join Date: Sep 2010
Location: Bangkok,Thailand
Posts: 8
Unhappy frequency separation-questions?

Well i have been trying to watch tutorials...And i watched one in retouchpro and also from anyother websites....I still cannot understand it that much...What's the purpose of it?And why do i have to use it?Please if you know very clear and detailed tutorials on internet,help me to find it????
Reply With Quote top
Old 10-08-2010, 03:15 AM
ShadowLight ShadowLight is offline
Senior Member
Join Date: Oct 2009
Posts: 397
Re: frequency separation-questions?

you can make much less "destructive" corrections on your image

one possible use is this:

you don't need to know why or how it does it,
just move the sliders to get the effect you like
Reply With Quote top
Old 10-08-2010, 07:18 AM
oneredpanther's Avatar
oneredpanther oneredpanther is offline
Senior Member
Join Date: May 2010
Location: Copenhagen
Posts: 166
Re: frequency separation-questions?

Maybe you don't "have to use it" just yet.
It depends on where you are in your progress as a retoucher, I suppose.

There are many many more things to learn before you get to frequency separation. My best answer is probably that if you don't know why you need it, then you don't need it yet.

The purpose of frequency separation is to split up skin into two (or more) layers

1. A low frequency 'underlayer' that the skin's color, tone and shape is held in. This is a smooth-looking layer that you can change without modifying the texture of the skin.

2. A high frequency 'overlayer' that has no colour or tone but contains just the 'details' of the skin, such as pores and hairs and spots and wrinkles.

By editing each of these layers independently you have fine control over the retouch.

Imagine accidentally spilling paint all over a painting, then trying to remove it again.
This would be so much easier if you could split the original and the spots into different layers and just clean the top one, and this is the essence of frequency separation.

Reply With Quote top
Old 10-08-2010, 08:17 AM
mistermonday's Avatar
mistermonday mistermonday is offline
Join Date: Dec 2005
Posts: 3,028
Re: frequency separation-questions?

Originally Posted by oneredpanther View Post
2. A high frequency 'overlayer' that has no colour or tone but contains just the 'details' of the skin, such as pores and hairs and spots and wrinkles.
Just one clarification to what Panth has written. The high frequency layer actually does contain color. If you wish to see the color and where it resides, just do a Ctrl+U (Hue/Sat) and drag the saturation slider all the way to the right.
In a normal freq separation, the HF layer contains all the edges which are equal to and less than the chosen Radius and the colors that resided on both sides of those edges are intensified (contrast has increased along those edges). Conversely on the Low Frequency layer below, the same edges at the same radius have had contrast reduced (edges blurred). When the two layers are added together (function of the Linear Light Blend mode) the result is the original image. GB + HP = Original.
You are pretty safe using the healing brush on the HF layer because it tend to copy and blend in texture without taking all of the color. However you need to be careful using the Clone Stamp tool when trying to clone texture from an area of very dissimilar color because the clone tool will take all of the color as well and you can end up with a mess.
Regards, Murray
Reply With Quote top

  RetouchPRO > Technique > Photo Retouching

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Great retouch video using Frequency Separation julianmarsalis Photo Retouching 15 08-24-2010 06:10 PM
Frequency Seps and profile conversions Flashtones Photo Retouching 17 06-29-2010 04:31 PM
Lighting, Meters and Gel Filter Questions dvbear Photography 16 02-22-2010 08:39 PM
masking and rotating questions Jerryb Photo Compositing 23 10-22-2009 11:38 PM
Feedback, comments, questions? Logoman Photo Compositing 7 12-20-2008 06:22 PM

All times are GMT -6. The time now is 11:31 PM.

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
SEO by vBSEO ©2011, Crawlability, Inc.
Copyright © 2016 Doug Nelson. All Rights Reserved