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.

Action for Frequency Separation

Thread Tools
Old 03-06-2011, 12:31 PM
mistermonday's Avatar
mistermonday mistermonday is offline
Join Date: Dec 2005
Posts: 3,028
Re: Action for Frequency Separation

Originally Posted by jonathan_k View Post
Perfecto. ... and the funny thing is that I didn't even know there would be colour contained in the HF layer at all. Or that it would an issue.

Double save Murray, thanks.
A High Pass or High Freq layer consists of edges, at and below the radius you have specified, whose contrasts have been increased, and the rest of that layer is grayscale ~128/128/128. You can verify this by dragging the Saturation slider all the way to the right. The GB or LF layer has had a reduction in contrast on those same edges as the LF layer. Individually those layers appear blurred and sharpened respectively. When you mathematically add the two layers together, you get the orig image. GB+HP=Orig. Having those edges in the HF maintain color is not necessarily a bad thing depending on what you are healing / cloning. The asymetric split where there is no color in the HF layer can be beneficial but the effect is different as you will see when you play with it. There will be situations where you do not want the texture to be too prominent.

Is there any major downside to converting an image from 8-bit to 16-bit?
There is no value in converting from 8 to 16 bit, in fact it is counter-productive because the data that was there in the original 16 bit file has already been destroyed. An analogy would be as follows:
You started with two number: 62.7854 and 23.5692. You rounded off the numbers to 62 and 23. Next you decided to perform some multiplication and because you wanted a great deal of accuracy, you made the numbers 6 decimal places > 62.000000 and 23.000000. Guess what - zero x zero = zero.
When you convert an 8 bit value to 16 bit you are just doubling your file size and not adding any value. My analogy is somewhat oversimplified but you get the point.
If you have an orig 16 bit file, it is always better to work with it from beginning to end in 16 bit and then spin off an 8 bit version for print or other 8 bit output.
Regards, Murray
Reply With Quote top
Old 03-07-2011, 03:36 AM
4personnen's Avatar
4personnen 4personnen is offline
Senior Member
Join Date: Jun 2010
Location: Lancing, UK
Posts: 350
Re: Action for Frequency Separation

Be also sure that If you use the "apply image" method, to check the values of scale, offset and the blending mode which are not the same for 16 bits and 8 bits images...
Reply With Quote top
Old 03-07-2011, 02:06 PM
jonathan_k jonathan_k is offline
Junior Member
Join Date: Sep 2009
Posts: 14
Re: Action for Frequency Separation

So. I've recorded an awesome 8-bit action and its all working swimmingly. And if I want to, I could do the same for the 16-bit. Thank you all for the help. Much appreciated.
Reply With Quote top
Old 04-15-2011, 12:17 PM
Chennae Chennae is offline
Junior Member
Join Date: May 2010
Posts: 6
Re: Action for Frequency Separation

Probably annoying now that you've already done it, but if you look at this thread - - and read through how to use the action, it's a real time saver!
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
question about frequency separation method Caravaggio Photo Retouching 12 07-16-2013 11:21 PM
Extended frequency separation fraiseap Photo Retouching 16 12-31-2010 12:33 PM
Photoshop Action nightmare... HELP!! iheartstudios Photo Retouching 10 11-03-2010 10:11 AM
RGB separation on 2 separate areas tatrader Hidden Power Support 1 03-09-2005 11:32 AM
Photo-Art Photoshop ACTION: Amateur Painter (works well on portraits) DannyRaphael Photo-Based Art 4 10-31-2002 12:50 AM

All times are GMT -6. The time now is 12:05 AM.

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