Re: Monitor calibration/profiling for video applications
Re: Monitor calibration/profiling for video applications
- Subject: Re: Monitor calibration/profiling for video applications
- From: Graeme Gill <email@hidden>
- Date: Thu, 16 Aug 2012 12:30:55 +1000
Dennis Dunbar wrote:
> Is anyone else familiar with the different approaches to color management? And if so could you help
> clear up the fog for me? (Do they really have something there, or are they just blowing smoke?)
Mostly blowing smoke :-) Typically Video and Film are aiming at a very
specific sub set of general color management: Emulation of a particular
standard. The print equivalent is side by side proofing. So most
of the talk is about calibration (ie. making a display device
behave in a specified way). ICC profiling is more general and
flexible, and provides a mechanism for actually achieving the color
management sub set desired by video or film.
Another key difference between Video/Film and general color management
is the mechanics used to transform color. Computer systems can use
software, which is very flexible but not necessarily real time.
Video/Film often have either very simple hardware controls (ie.
"brightness" and "contrast" knobs. "RGBCMY" primary controls that don't
work so well, per channel curves etc.) or the high end actually has
hardware capable of per channel, matrix and 3D cLUT transforms (ie.
all the machinery ICC profiles use). What's loaded into the 3D cLUT is
the equivalent of a device link. (Note though that real time computer
color CMM's can be implemented using GPU's.)
Graeme Gill.
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