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Color Chart Question...
Old 07-21-2004, 10:24 AM   #1 (permalink)
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Can anyone describe his or her method for using a color chart? And do you have the rgb and cmyk value breakdowns for the colors to be used in photoshop so you can tweak the colors?
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Re: Color Chart Question...
Old 07-21-2004, 10:05 PM   #2 (permalink)
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I haven't used one yet but I will be soon because accurate colors matter and manual white balance isn't always accurate enough.

Using Photoshop I would use the color sampler tool to set two points, one on white and the other on black. Using the data in the Info tab and Levels, you can then adjust out any color cast that may exist.


Israel
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Re: Color Chart Question...
Old 07-22-2004, 10:20 AM   #3 (permalink)
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Your color chart should be used for the grays as that will remove all the color cast introduced into the photo. If you simply do white and black that is OK. If you do white, black and 50% gray (midtone) that is even beter. If you do white, black and as many gray tones as you can that is best. That would give you a custom curve that will remove slight casts. I wouldn't worry so much about the other colors. Beyond 1 level of gray, you will have to adjust using a curve adjustment layer.
 
 
Re: Color Chart Question...
Old 07-22-2004, 06:42 PM   #4 (permalink)
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Hey, Casey! I recognize that Macbeth chart!



I don't have the CMYK and RGB values for PS - they might be on the Macbeth web page or some other reference.... but, I'm not too worried about absolutely correct color in my work, so that's not a big worry for me.

The way I use the color chart is:

1 - you can use the white or grey squares to visually color balance an image.

2 - with Nikon's Capture editor, I customize my curves to known white, grey, and black squares... (of course, you can do the same thing in Photoshop but I find it easier and quicker in Capture)

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Re: Color Chart Question...
Old 07-23-2004, 08:55 AM   #5 (permalink)
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Hey thanks for the use of the chart and the added info. I liked the Dallas Workshop that Rolando put on a lot and the fact that I am buying some Dyna-lites today it just paid for its self with the workshop discount.... next step is to get one of these charts and start playing around with it..... Are you going to go to the Austin event JT is going to put on?... that should be good...
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Old 07-23-2004, 10:27 AM   #6 (permalink)
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Casey,

Having to wait a bit for final clearance, but I'm working on the assumption that I'll be able to go. Having to wade through my Dad's estate is adding a bit of uncertainty to the calendar, but...

Congrats on the Dyna's... you'll have fun with 'em!

Here's another to show that color charts can be useful...



Color chart? What color chart?

Wayne
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