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.

Correcting Color...

Reply
 
Thread Tools
  #1  
Old 04-21-2005, 09:32 AM
fat0n3s fat0n3s is offline
Member
 
Join Date: Apr 2005
Posts: 62
Correcting Color...

I have read many tutorials, and I am still confused on how to correct an image to restore the colors to what they are in real life.

Some images are easy, in the sence I can find a true grey color, then go off the numbers till it is correct. At least close to it.

I am a numbers guy, and would like to go by the numbers for the most part.

Ok, here are my questions.

1. How do you restore colors in an image without "true grey" anywhere to be found?

2. Is there a way to find true grey in a picture without relying on just your eyes?

3. Is finding the correct color a guessing game, or is there a meathod to use numbers in hitting the right color?

4. How does Flora make images look so real and life like without using numbers?

5. I am getting the hang of the curves tool, but how do I know when I hit the right color?

6. Am I asking to many questions?

7. Do we need a poll for #6?

Sorry, enough fooling. If anyone could answer, or direct to a link that could answer these questions, it would really help me over this dang color hill.

TIA.
Reply With Quote top
  #2  
Old 04-21-2005, 10:09 AM
Hephaestos's Avatar
Hephaestos Hephaestos is offline
Member
 
Join Date: Jan 2005
Location: Denver, CO
Posts: 59
I seldom have trouble finding a gray point in an image on which to do an adjustment (anything "black" or "white" in the image can serve as gray as well: deep, underexposed shadows, whites of eyes, clouds, snow, etc.).

One trick is to use Threshold and slide back and forth to find the darkest and lightest points in the image, these are generally pretty close to "black" and "white".
Reply With Quote top
  #3  
Old 04-21-2005, 11:13 AM
Swampy's Avatar
Swampy Swampy is offline
Senior Member
 
Join Date: Feb 2005
Location: The Swamps of Florida
Posts: 4,418
I go by the info palette and look at the "K" value. I can always finde something that is really really close.
Reply With Quote top
  #4  
Old 04-21-2005, 02:47 PM
realaqu's Avatar
realaqu realaqu is offline
Senior Member
 
Join Date: Feb 2005
Posts: 109
Hi
this link might do some help.
http://homepages.ihug.com.au/~larryk...ct_visual.html

Realaqu
Reply With Quote top
  #5  
Old 04-22-2005, 07:25 AM
Flora's Avatar
Flora Flora is offline
Senior Member
 
Join Date: Mar 2002
Location: Milan, Italy
Posts: 2,325
Blog Entries: 3
Hi fat0n3s,

Welcome to RP!

I couldn't agree more with what Hephaestos said .... it is a rare occasion when I can't find acceptable black/white or grey points (or the closest thing) in a picture .... As suggested, finding the lightest and/or the darkest points in a picture might be a big help and this can be achieved via Threshold as Hephaestos wrote, or by keeping the 'Alt' key pressed while moving highlights and shadows sliders in an open Levels dialog box ... (won't work with mid-tones, though...)

Correcting, applying or changing skin colour is the most delicate task in colour correction and, when nothing else works, here are Katrin Eismann guidelines:
Mode CMYK
  • in light skinned babies, yellow and magenta are equal,

  • In adults, yellow is up to 35% greater than magenta,

  • Cyan makes people look tanner and darker,

  • Only people with very dark skin should have noticeable amount of black ink in their skin tones.

As for me .... I've always had ... and still have... a love-hate relationship with numbers ..... ... I recognize their vital importance, but try to avoid them whenever possible!!! When working with images I just change and re-do until it 'looks' right....

You might have been 'there' already, if not, a number guy like you, might find this Thread quite interesting ....
Reply With Quote top
  #6  
Old 04-22-2005, 08:44 AM
fat0n3s fat0n3s is offline
Member
 
Join Date: Apr 2005
Posts: 62
Wow.

Thanks alot for all the great help. This forum is really impressive.

After reading your replies, and doing some testing, I am begining to get much better results than before.

Thanks agains.
Reply With Quote top
  #7  
Old 04-29-2005, 09:03 PM
llinares's Avatar
llinares llinares is offline
Junior Member
 
Join Date: Oct 2003
Location: Spring Hill Tennessee
Posts: 13
One way I have found in Photoshop that works sometimes to find neutral grey is to add 50% grey layer with a blending mode of 'Difference'. Generally, the darkest area will be closest to neutral grey. I like 'using the numbers' also, so I just cursor over the darker areas until i find the spot closest to black and mark it with a color sampler. Then I trash the layer and add a Threshold layer to find the white and black points. I can't remember where I read about the tip to find neutral grey. I think it was Dave Cross in Photoshop User magazine. Hope this helps.
Reply With Quote top
  #8  
Old 04-30-2005, 11:49 AM
Flora's Avatar
Flora Flora is offline
Senior Member
 
Join Date: Mar 2002
Location: Milan, Italy
Posts: 2,325
Blog Entries: 3
Hi llinares,

Welcome to RP!

....and thanks for the great Tip!!!
Reply With Quote top
  #9  
Old 05-11-2005, 10:44 AM
fat0n3s fat0n3s is offline
Member
 
Join Date: Apr 2005
Posts: 62
Quote:
Originally Posted by llinares
One way I have found in Photoshop that works sometimes to find neutral grey is to add 50% grey layer with a blending mode of 'Difference'. Generally, the darkest area will be closest to neutral grey. I like 'using the numbers' also, so I just cursor over the darker areas until i find the spot closest to black and mark it with a color sampler. Then I trash the layer and add a Threshold layer to find the white and black points. I can't remember where I read about the tip to find neutral grey. I think it was Dave Cross in Photoshop User magazine. Hope this helps.

Great tip!

It makes it much easier to locate the greys.

Thanks alot.
Reply With Quote top
  #10  
Old 05-11-2005, 11:13 AM
Racc Iria's Avatar
Racc Iria Racc Iria is offline
Senior Member
 
Join Date: Apr 2005
Location: Rockville, MD USA
Posts: 252
When adjusting an image by eye, get the skin tones to look good and the rest will generally fall into place. But always, start with the skin tones.

The skin tones are what gives the visual cues about color (assuming there are people in the image). If the skin tones look right, the brain will "assume" the other colors are right, as well. If the skin tones are off, then the brain knows the color of everything in the image is bad and so it looks wrong.

I usually tend to adjust an image by eye first before resorting to the more mathematical means. Often I'll combine both methods on different layers... skin tones by eye on one layer, the rest of the image more mathematical on another, then blend them using a layer mask.

I'm like Flora in that I like to make adjustments based on how it looks. I tend to use the more mathematical means as a kind of backup when I can't get it to look right by eye.
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
Tutorial 05: Converting a Color Image to Black and White grayscale BW DannyRaphael Photo-Art 101 17 05-22-2011 04:55 PM
AIM color space - Gamma 1.00 Ron Photo Retouching 28 09-02-2010 06:48 PM
help with german Photoshop commands please pure Photoshop Help 9 06-21-2010 02:33 PM
Film scanner for home use? bodegg Hardware 12 05-20-2007 11:40 AM
Create A Custom Color Palette Swampy RP Tutorials 2 05-24-2006 12:00 PM


All times are GMT -6. The time now is 06:05 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