I need a little help please

Antonio Correia

I shot this picture and some others and they turned to be too red.
I have been reading Dan's book but I lack of more knowledge and study. :bash:dunno
I know - or I think I know - how to remove this red on chanel b.
The problem is that it never turns a nice tonality of skin.
Can I have a tip, please ?
Obrigado.

Duffy Pratt

Red is in the A channel, not the B. That may be your problem.

Duffy

Andy

Antonio Correia wrote:

I shot this picture and some others and they turned to be too red.
I have been reading Dan's book but I lack of more knowledge and study. :bash
I know - or I think I know - how to remove this red on chanel b.
The problem is that it never turns a nice tonality of skin.
Can I have a tip, please ?
Obrigado.

Others can and will give you some LAB tips, but...
30seconds
http://www.smugmug.com/help/skin-tone

DavidTO

Duffy Pratt wrote:

Red is in the A channel, not the B. That may be your problem.

Duffy

Magenta and Green are in the A.

Yellow and Blue are in the B.

Red is in neither. Red is magenta and yellow.

cerement

Either way, that sunburn is pretty darn magenta ...

Antonio Correia

Duffy,
Thank you. I knew channel a is for magenta and green and b for yellow and blue.

David,
So, it means one has to arrange both channels to get the red.
That's the issue.
OK. As a matter of fact I have - not only read Dan's book - but your tuttorial which I have printed. The one with the horse and your young daughter.
I must have time to absorb ...
Obviously, from text to practice goes a distance.
It's that distance I have to go throught.
It was a good and useful tip.
One has to master theory of colour before learning to use LAB correctly
Obrigado.

Andy,
Obrigado.
You know what ? Sometimes the best ways are the easiest ! :

Antonio Correia

cerement wrote:

Either way, that sunburn is pretty darn magenta ...

In one of my tries, which I have not posted, and when I was only "arranging" channel a I had the face too yellow...
Red is magenta and yellow. :
Obrigado...

Antonio Correia

Andy.
I don't like to read long text in the computer. My eyes get tired...
I have been to your link and I tried to copy to Word.
I was sorry because all the text is gone...
You can't fix that can you ?
I don't think you can ...
Thanks.

DavidTO

Antonio Correia wrote:

So, it means one has to arrange both channels to get the red.

No, not exactly. Your shot had too much magenta for the amount of yellow. It's a balancing act. Skin almost always has both magenta and yellow in it. If you're working in LAB, then you want to make sure that yellow is always a few points greater than magenta (B has a higher number than A). The link that Andy posted is another way at the same thing.

Your shot has too much of both. It looks like she was below an awning or something that was making a color cast.

I think that for this image, Andy's on the right track. It's much easier (IMO) to correct this image in RGB. You'll find that even Margulis says that RGB is the preferred space to correct for color casts. Check out Rutt's Portrait thread (chapter 16, I think?), and I believe you'll read the same thing there.

All I did in RGB was pull down the red until it looked right to my eye and by the numbers, and then steepened the RGB curve a touch for more contrast. A lot more can be done with this shot, but the basic fix is very easy once you understand what's going on in the RGB/LAB channels.

Antonio Correia

DavidTO wrote:

No, not exactly. Your shot had too much magenta for the amount of yellow. It's a balancing act. Skin almost always has both magenta and yellow in it. If you're working in LAB, then you want to make sure that yellow is always a few points greater than magenta (B has a higher number than A). The link that Andy posted is another way at the same thing.

Your shot has too much of both. It looks like she was below an awning or something that was making a color cast.

I think that for this image, Andy's on the right track. It's much easier (IMO) to correct this image in RGB. You'll find that even Margulis says that RGB is the preferred space to correct for color casts. Check out Rutt's Portrait thread (chapter 16, I think?), and I believe you'll read the same thing there.

All I did in RGB was pull down the red until it looked right to my eye and by the numbers, and then steepened the RGB curve a touch for more contrast. A lot more can be done with this shot, but the basic fix is very easy once you understand what's going on in the RGB/LAB channels.

Thank you David.
I'll go and try.

Nikolai

Antonio,
As always, there are lots of ways to to things in PS.

Here's one of my personal favorites: Match Color/Neutralize:



Looks ok to me both visually and by the numbers

HTH

PS
Tirck: it restored the color on the face and gave a blue tint to the wall, so I simply masked it back...

Antonio Correia wrote:

I shot this picture and some others and they turned to be too red.
I have been reading Dan's book but I lack of more knowledge and study. :bash
I know - or I think I know - how to remove this red on chanel b.
The problem is that it never turns a nice tonality of skin.
Can I have a tip, please ?
Obrigado.

Antonio Correia

Look what I have done
How good is it as final project ?

Here the background is not important... so, the change of colour ...