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Great AttilaLToth 2008-05-14 14:39

I give you the smiley for your "courage" to make an exception from your beloved landscape subjects and for the intention to start a discussion about color correction in the workshop since I benefit at most from such discussions.

Of course ;) I must assert that my workshop version is better than yours.
Accept the challange!?
:))

I'll upload the screenshots tommorow since I reached the upload limit.

Atti

  #1  
Old 05-15-2008, 12:41 AM
Nelu_Goia Nelu_Goia is offline
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Join Date: Feb 2006
Posts: 388
Default To AttilaLToth: "Accept the challange!?" Yes, sure enough!:

Servus Atti,
I need to make some remarks about your workshop but first I really have to thank you for your time.
OK,no more nice guy!:)
1.First,if there is a major color cast in the photo but not in the highlights or (and) the shadows, you do not go to Lab mode until it`s fixed in RGB,because it is much easier to do it here.If the color cast is uniform all over the picture (which used to happen with the film cameras,but not with the digital cameras,which are worse in this regard),you can take it out fast in Lab.
2.I did not posted a workshop.The one I posted is the original image,without any alteration,so you cannot criticize me for that.
3.If it is to be picky about technicalities,you made some mistakes in the workshop and I can prove it:
-Your gray point on the small camera (number 4)shows me the following readings:R=99,G=104,B=85,which is kind of green,isn`t it?
-Your "white" hat is actually slightly green. The a channel (in Lab) measures between -2 and -5.In my case it shows 0 and -1.
-The worse is your shadow areas,which are totally plunged in (they measure 0,0,0),and it`s not just the watch wrist.
"Color by the numbers",right?:)
-The hand color is more correct in your version,though...
Thanks again,
Nelu
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  #2  
Old 05-15-2008, 07:41 PM
AttilaLToth AttilaLToth is offline
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Posts: 9
Default Colors by the numbers and more ...

Hello my friend!

You're welcome - however I'd say the benefit of learning is on my part. :)

My screenshots are there now too.

About my workshop:
I spent some time investigating the original jpeg - by numbers, eyes and even brain mind you ;).
I poked around with rgb, cmyk and lab (every picture has 10 channels, right ?) and some combinations of them to get a feeling for the feasible.

About your comments:
1. "major color cast": Doesn't it have a major one ?? Try to reproduce the changes in screenshot 1 - I think it has.

2. "workshop intent": I surely confused my intent with yours :)
But don't mistake it - as soon as it is published it's out of your control and since you allowed workshop posts ... here we go.

3. "mistakes": I measured the points as follows:
1: a=-2 b=1, r=249 g=252 b=249 (cap: slight green)
2: a=13 b=13, r=96 g=64 b=52 (right hand: red)
3: a=11 b=15, r=130 g=99 b=81 (left hand: yellowish red)
4: a=17 b=9, r=114 g=75 b=73 (right thumb: red)

You can count the shadows as the price of the different moves all the more that imho they don't really contain significant subject related infos. Concerning the background the only usefull info there seems to be some colors (the white of the shirt, etc.).

So yes it is based on "by the numbers" and is more than that... (ouch this is toward self-praise now).

Thank you for the good learn so far.
I keep on rtfm-ing :))

See you soon.
Atti
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