[argyllcms] Re: LCD TV

On Fri, 2008-08-01 at 13:31 +1000, Graeme Gill wrote:
> Leonard Evens wrote:
> 
> > Presumably I can do the calibration of the TV so that nothing is
> > uploaded to the video card and all color management is in the profile,
> > and then modify  image files using the appropriate profile so they would
> > show up correctly on the TV.   I believe I've done equivalent things
> > before, but I don't remember the details.  Do I have it more or less
> > right?
> 
> In principle it's right, in practice it can be hard to achieve. You can't
> calibrate, but you can profile, but how to profile is a problem.

Since the LCD TV set has a VGA port, I think I may be able to plug a
laptop into it and treat it as a monitor.  In that case, everything
should work except that I have to tell argyll not to do any calibration,
just to create a profile.  I think that is possible, but I just don't
remember how to do it.

Of course, if I am wrong, then I have a real problem.  I might have to
wait until I can afford a TV set that has its own built-in color
management.

>  Typical
> display measurement instruments measure one patch at a time, so you
> have to present series of patches somehow, and synchronize the measurement
> of them. It might be possible to setup some pre-determined patch sequence
> on a DVD and then somehow figure out how to read them with an instrument,
> but Argyll doesn't support this idea at the moment. If you had an instrument
> that's capable of fast readings (e.g. and i1pro), it might be possible
> to sample continuously and then automatically determine the patch boundaries,
> but I'm not sure how that would work with an instrument that might take
> up to 8 seconds per patch. The practical approach becomes having an IR
> (Infra Red remote) output on the computer, and using it to advance the DVD
> patch by patch under computer control. I'd imagine there are some color
> management systems that support this; commercial or maybe the HCFR project.
> The IR driver needs to somehow know the codes of popular DVD players of 
> course,
> or have some way of recording and playing back such a code.
> 
> Of course in theory a TV system should be operating in a standard color
> space (ie. NTSC), although it wouldn't surprise me if the accuracy with
> which they conform to such standards is low, especially when each manufacturer
> is striving to stand out in the marketplace.
> 
> Graeme Gill.

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