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Canon XH Series HDV Camcorders
Canon XH G1S / G1 (with SDI), Canon XH A1S / A1 (without SDI).


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Old March 17th, 2007, 08:56 PM   #1
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what is color phase exactly?

hi guys, wondering if someone could tell me exactly what the color phase setting does. I can't seem to find much info on it....
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Old March 17th, 2007, 10:39 PM   #2
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I don't have an A1 (yet, but soon) but everywhere else in the video world you can call it "tint" - try adjusting the "tint" control on your television to see what it does - then aim your cam at someone's face (with good light) and see if adjusting the phase control does the same thing... Steve

Have you checked page 65-67 of your manual?
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Old March 18th, 2007, 05:49 PM   #3
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yeah, the manual doesn't give much information at all about the cph setting. But it being a "tint" function makes sense.
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Old March 18th, 2007, 06:59 PM   #4
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Phase is the strictly correct term for what is often termed "tint" or "hue" on consumer equipment.

It is really on of significance for NTSC video. It refers to a phase difference added to a colour reference signal used to decode the colour information. (PAL video removes the need for a colour reference signal using a technique that inverts the phase every video line - hence the term "Phase Alternating Line").

See http://en.wikipedia.org/wiki/NTSC#Color_encoding for description of how the colour information is encoded for NTSC.
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Old March 18th, 2007, 08:09 PM   #5
 
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if you can envision the colors on a rainbow, the analogy is to a wheel of color, where primary and complimentary colors are juxtaposed on a continuous circle or wheel. Thus any primary color, when combined with its opposite on the wheel, yields a neutral gray, luminance with no chroma. Now, if you can wrap that around your brain, think if phase difference as a rotation of the wheel. So that a phase difference of 180 degrees is the complimentary color, a phase difference of 360 degrees returns to the original color, and so on.
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Old March 18th, 2007, 11:43 PM   #6
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wow! thanks john, thanks bill! Thats exactly what I was looking for, i can't imagine a more straightforward response explaining color phase technically and conceptually. These boards a great! A big thanks to everyone who answer all my silly questions!
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Old March 18th, 2007, 11:50 PM   #7
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This is what the vectorscope is for. It displays color phase information to you as well as saturation. As was stated, a given color in the NTSC system has a phase relationship to the reference signal (chroma burst). The AMPLITUDE of the chroma burst signal determines color saturation. So, when you look at the vectorscope, the display will show a given color as a position on the circle and the saturation will determine how far away from center the display is.

-gb-
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