By The Numbers - kessi

This board is for the January 2009 Curvemeister 101 class.
kessi
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Postby kessi » Wed Feb 04, 2009 1:40 pm

I first did a by-the-numbers in RGB and applied it, but saved the curve and then did a 2nd turn because I wanted to apply a skin tone. I reloaded the curve and applied the skin tone.

kessi

ggroess
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Postby ggroess » Wed Feb 04, 2009 5:53 pm

Kessi,
You might want to apply the skin pin and then do the color by the numbers correction.
The example ended up with good skin tones after the color cast was removed.  I did not need a skin pin. 

When you pin the Skin you will adjust the color of the image.  Hence the reddish cast in the white of the door frame.  In RGB you should be able to get the skin right, then BTN adjust the image without messing up the skin.  you might need to skip the mid tones as a part of the BTN if you feel the skin tones get messed up by the correction.

Greg

kessi
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Postby kessi » Wed Feb 04, 2009 7:12 pm

OK, I'll try that. I only added the skin pin as an afterthought.

kessi

mikemeister_admin
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Postby mikemeister_admin » Wed Feb 04, 2009 9:45 pm

Kessi,your neutral should be the average of the first three numbers,100,128,138=366/3=122.This might tone down some of the red.For the shadow aim for 9 or the lowest number,for the hightlights go for 250.For the highlights and shadows you can either slide the diagonal or curve it.BTN is great for some images.GregM

ggroess
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Postby ggroess » Wed Feb 04, 2009 10:24 pm

Good catch on the neutral GregM

Kessi, the average is from the original numbers in RGB before you make any adjustments for shadow or highlight.  I usually write these down when I do a BTN correction.

Greg

mikemeister_admin
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Postby mikemeister_admin » Wed Feb 04, 2009 10:42 pm

I didn't know that(or forgot it).You should set neutral first then hightlight and shadows?

ggroess
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Postby ggroess » Thu Feb 05, 2009 1:15 am

Setting a neutral defeats the whole purpose of BTN correction.

BTN is a correction method that makes you rely on the image data to help you set neutrals without using the "Set Neutral" function of CM.  Some people prefer the BTN correction as they feel they have more subtle control over the image.  If you have PS running in Appleland...you do not currently have access to CM and are stuck with PS's neutral function in color correction.  Many people do not like that "feature".  BTN is a common practice when you don't like the PS tool.

If you watch the video you will see that I do ends of the curve first then the mid-tones.  If you do the mid-tones first you will put a pivot point into the curve that can give you some trouble as you go forward. 

I usually do not set the highlights above 250 the shadows below 10 and the Neutral, if I have one; is always the average of the RGB values before the highlight and shadow corrections. 

Greg


mikemeister_admin
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Postby mikemeister_admin » Thu Feb 05, 2009 4:10 am

I see ,I misread the comment,GregM

kessi
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Postby kessi » Thu Feb 05, 2009 8:44 am

Hi Greg,
I did the averaging on the incorrect numbers. Thanks for pointing it out. I'll try again.

kessi

kessi
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Postby kessi » Sun Feb 08, 2009 10:33 am

I did a run in HSB to adjust the Brightness.

kessi


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