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Subject: Re: ACR Calibration



I picked up a Macbeth ColorChecker target today and tried out Thomas Fors script to see how well it worked. The results are totally wacky and I'm wondering what I might have done wrong:

I set up the target on a copystand and shot with a Nikon D200. I used polaroid filters on both Camera and lights to eliminate reflections.

I opened the resulting NEF in ACR 3.3 and turned off the auto settings. I then set the white balance using the light gray value on the target. ACR was set to 8 bit/ ProPhotoRGB and the smallest size. I opened this in CS2 and used the pen(path) tool to click on the Brown, White, Black and Turquoise squares (resulting in a "[" shaped open path) and then launched the script.

The first result (after 54 minutes) was:

Color Temp: 49850
Tint: 135
Exposure: -2.25
Shadows: 27
Brightness: 125
Contrast: -50
Saturation: 0
Shadow Tint: -100
Red Hue: 100
Red Sat: 100
Green Hue: -100
Green Sat: -100
Blue Hue: -97
Blue Sat: -100

Entering these Calibration values in ACR 3.3 resulted in a target that displayed so 'wrong' as to be nonsensical.

Thinking that it might be an issue with the polorizers I removed them and this resulted in an image that looked more like "Macbeth_ColorChecker_ProPhoto.jpg". I then repeated the procedure and 63 minutes later I got:

Color Temp: 19950
Tint: 87
Exposure: -1.95
Shadows: 86
Brightness: 113
Contrast: -50
Saturation: 0
Shadow Tint: -100
Red Hue: 100
Red Sat: 100
Green Hue: -100
Green Sat: -100
Blue Hue: -99
Blue Sat: -99

These values also result in nonsense.

Thanks for any ideas on what's going on?

System details: CS2, P4 3.0, 2Gb RAM, OptixPro generated monitor profile, XP-Pro SP2.

Russell

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