WK 3- Ex 2 Fruit Vendor

This board is for the January 2008 Curvemeister 101 class
mikemeister_admin
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Postby mikemeister_admin » Fri Feb 01, 2008 12:25 am

Mike, there is something I don't understand (again) that pertains to neutrals.
1) When I apply a neutral to the aluminum window frame why is it still green, yellow, magenta and whatever colors. I thought that when I tell the frame its neutral why isn't it neutral?
Thanks Joe S

-default
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Postby -default » Fri Feb 01, 2008 12:57 am

It does tell the frame to be neutral, but only for the location where the neutral is located.  To verify this, right click on the neutral and click "Show Info".  That will create a hue clock for the neutral.  Other parts of the frame are slightly different colors, and they may be improved, but they still have some color.

ggroess
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Postby ggroess » Fri Feb 01, 2008 1:28 am

Joe,
You can also think of it this way.  The color cast in the frame is not consistant.  The parts that are consistant with the neutral you choose will be corrected to the neutral you set but only the pixels with the same value as the ones under your sample point. 

Since the frame is for lack of a better term "warped" and reflecting many different hues, you can "adjust" them but not remove them.  The green or magenta you mark is not the same "value" as some of the others in the frame.  Those others will be changed but not completely corrected.

It's kind of like saying the apple is red...this is a true enough statement but just how red is it?  If it is the same red all the way across the apple will have no shape. To shade it you have color and luminosity.  If the luminosity changes then you might say the red is the same hue but a different tone.  If the hue changes you have a color shift...you can shape a red apple with blue and green to create shadows that are not neutral.
Greg

mikemeister_admin
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Postby mikemeister_admin » Sat Feb 02, 2008 7:11 pm

Greg, what is a good sample size to use. Most often I don't think about those details once set. I have been using a 5x5 sample.
Thanks Joe S

ggroess
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Postby ggroess » Sat Feb 02, 2008 9:24 pm

I set mine to 3X3 but with the lower resolution of the web images I sometimes have to go up to 10X10.  I usually ask that question when I cannot seem to find a neutral in a spot I know one exists.

Try different settings and see what you find most acceptable.  I tried it on 10 X 10 for quite a while before i changed to 3X3

Greg


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