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Camera Calibration?
Old 11-09-2004, 03:54 PM   #1 (permalink)
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Does any one Calibrate their Camera? And what is involved in getting that done? I have a Canon 20D...
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Re: Camera Calibration?
Old 11-09-2004, 06:32 PM   #2 (permalink)
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Why are you considering getting it calibrated?

Mike
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Re: Camera Calibration?
Old 11-09-2004, 06:35 PM   #3 (permalink)
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I was told you will get more consistant color thus better color... Is this untrue?
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Re: Camera Calibration?
Old 11-09-2004, 07:22 PM   #4 (permalink)
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Most cameras have a genetic code. Basically they do what they do because of decisions made in the development of their sensors and other systems. Some are incapable of becoming something other than what they were designed to be. You cannot make a Canon shoot like a Nikon or vice versa, unless it is in how you expose each frame and compensations that you make not the camera. You can shoot color charts and balance to those each time you shoot but what you are doing is calibrating the camera to those lighting conditions.

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Re: Camera Calibration?
Old 11-09-2004, 07:53 PM   #5 (permalink)
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Casey

I think you're asking "Should I create a color profile for my camera?" I'm not sure what options that 20D has, but many of the cameras flag their images with a color profile that can be read by Photoshop and it "interprets" what your camera meant by red, blue, green, etc. Check the manual and see if there isn't an option to turn color profiles on or off -- and turn it ON!

Bob
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Re: Camera Calibration?
Old 11-09-2004, 10:33 PM   #6 (permalink)
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Try setting the white balance using a grey card, the difference is incredible and you might get the colors you are looking for. Tat236 turned me into a believer. I think he might be able to help you,too. If that's what you're looking for.
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Re: Camera Calibration?
Old 11-10-2004, 02:21 PM   #7 (permalink)
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video signals are calibrated with a wave form monitor (luma levels) and a vectorscope (color). we often do this on set, and virtually always in post.

the histogram is closely akin to a waveform monitor. since luma levels effect color value, checking your histogram will, in addition to giving you good info re the black and the highlights, also help produce more accurate color values. (assuming you're white balanced correctly.)

every time you re-set your white balance you are, essentially, re-calibrating your camera for color values.

but are you talking about other camera calibrations? these, btw, are most usually performed by a tech using test equipment.

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Grey or white ?
Old 11-11-2004, 04:56 PM   #8 (permalink)
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There does not seem to be any real difference in using a grey or white card. Either seem to give almost identical results.

See my extended post with examples in this forum at: Custom White Balance (Canon 20D - notes)

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