RetouchPRO

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.

RGB CMYK LAB and Dan Margulis !

Reply
 
Thread Tools
  #71  
Old 09-16-2011, 10:03 PM
andrewrodney's Avatar
andrewrodney andrewrodney is offline
Senior Member
 
Join Date: May 2010
Location: Santa Fe
Posts: 1,091
Re: RGB CMYK LAB and Dan Margulis !

LCH= Luminance, Chroma and Hue. Is from the old LinoColor scanner days, a variant but not a direct numeric scale as Lab. Similarly we see HLS (Hue Luminance Saturation) in Lightroom and other applications. Actually LCH and HLS are a bit more intuitive systems to teach and learn (aStar and bStar isn’t)
Reply With Quote top
  #72  
Old 09-17-2011, 07:37 AM
jeno jeno is offline
Junior Member
 
Join Date: Sep 2011
Posts: 7
Re: RGB CMYK LAB and Dan Margulis !

I guess learning LAB would be enough than?
Reply With Quote top
  #73  
Old 09-17-2011, 08:35 AM
John Wheeler's Avatar
John Wheeler John Wheeler is offline
Senior Member
 
Join Date: May 2011
Location: Colorado
Posts: 583
Re: RGB CMYK LAB and Dan Margulis !

Hi Jeno
I personally would concentrate on learning the color modes that are supported by the software you use. IMHO
Reply With Quote top
  #74  
Old 09-17-2011, 11:36 AM
andrewrodney's Avatar
andrewrodney andrewrodney is offline
Senior Member
 
Join Date: May 2010
Location: Santa Fe
Posts: 1,091
Re: RGB CMYK LAB and Dan Margulis !

Quote:
Originally Posted by jeno View Post
I guess learning LAB would be enough than?
Learn to do what?

Since Lab is a direct mode you can convert to (I find the use questionable) and Lab output values are available in RGB/CMYK color mode, while LCH and others are not, yes. It would be useful to be comfortable with the scale depending on what you hope to accomplish. But the same is true for say RGB.

These are just numeric values. Much depends on what you need to do with your images, where they came from (their color space and condition) and ultimately what you hope to accomplish. IMOH, Lab has been over sold as some kind of color model of the month. I use it a LOT for what I think its really good for (color analysis when linked to what is known as deltaE). For image editing, not so much. Its useful no question as are other color models. I guess I’m saying, don’t buy into it as some magical system, its good for some tasks, not for others.

The first thing to learn about Lab is its not an acronym (nor is raw) <g>.
Reply With Quote top
  #75  
Old 09-18-2011, 08:20 AM
jeno jeno is offline
Junior Member
 
Join Date: Sep 2011
Posts: 7
Re: RGB CMYK LAB and Dan Margulis !

Thanks andrewrodney & John Wheeler,

Retouching images to suit various printing process (flexo, gravure, offset, letterpress, silkscreen...etc) is what i am looking at currently. I guess it is Important to know how to "see" / "read" color before retouching it.

The more i read through the forum the more i doubt that i am looking at the wrong place. I need images to be printable and "print nice" instead of "look nice".



Thanks.
J
Reply With Quote top
  #76  
Old 09-18-2011, 11:59 AM
andrewrodney's Avatar
andrewrodney andrewrodney is offline
Senior Member
 
Join Date: May 2010
Location: Santa Fe
Posts: 1,091
Re: RGB CMYK LAB and Dan Margulis !

Quote:
Originally Posted by jeno View Post
Retouching images to suit various printing process (flexo, gravure, offset, letterpress, silkscreen...etc) is what i am looking at currently.
J
Those images are in an RGB working space or already in some kind of output colors space (CMYK for those processes)?
Reply With Quote top
  #77  
Old 09-18-2011, 07:33 PM
jeno jeno is offline
Junior Member
 
Join Date: Sep 2011
Posts: 7
Re: RGB CMYK LAB and Dan Margulis !

CMYK most of the time.
Reply With Quote top
  #78  
Old 09-18-2011, 09:27 PM
andrewrodney's Avatar
andrewrodney andrewrodney is offline
Senior Member
 
Join Date: May 2010
Location: Santa Fe
Posts: 1,091
Re: RGB CMYK LAB and Dan Margulis !

Quote:
Originally Posted by jeno View Post
CMYK most of the time.
Then you are working in the output color space. The conversions have been made. Lab is questionably useful at this point.
Reply With Quote top
  #79  
Old 09-18-2011, 11:41 PM
jeno jeno is offline
Junior Member
 
Join Date: Sep 2011
Posts: 7
Re: RGB CMYK LAB and Dan Margulis !

Any suggestion what should i be looking for?
Reply With Quote top
  #80  
Old 09-19-2011, 09:01 AM
andrewrodney's Avatar
andrewrodney andrewrodney is offline
Senior Member
 
Join Date: May 2010
Location: Santa Fe
Posts: 1,091
Re: RGB CMYK LAB and Dan Margulis !

Quote:
Originally Posted by jeno View Post
Any suggestion what should i be looking for?
A well calibrated and profiled display for one. If the images are converted to an output color space (and by who and how well), one would certainly hope nearly all color and tone correction was done long before the conversion. You’ll have to describe more about your workflow to go much father.
Reply With Quote top
Reply

  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
Photoshop Channel concepts: The Power of Ten Graphics23 RP Tutorials 102 07-27-2011 11:57 AM
LAB Book mdavis Non-RetouchPRO Resources 14 08-08-2006 08:24 PM
Reconsidering 16 bit Ed_L Input/Output/Workflow 14 11-01-2005 10:41 AM
Dan Margulis Lab color DannyRaphael Non-RetouchPRO Resources 0 10-28-2005 12:44 PM
PC/Win filter for Lab mode: Minor ab Manip Stroker Software 15 09-25-2005 08:16 PM


All times are GMT -6. The time now is 02:26 AM.


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