[argyllcms] Re: Video color grading with print reference
- From: Matthieu DUBAIL <matthieu.dubail@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Tue, 18 Oct 2011 14:56:18 +0200
Thanks,
Actually, I won't be able to work on prints prior video color grading. The
only thing I can do is working on light table source. I know I'll get some
color inaccuracy but it might be better than having to do direct comparison
between D50 illuminated print and D65 video display.
As for brightness, the light table tubes are dimmable but I know that it
directly affect their color and IRC. I might get rid of magenta shift by
using color filter gel.
I once tried to figure out how to compute color filter gel correction (kodak
CC filters) from a argyll-i1pro mesurement, the way photo-cine
thermocolorimeters do. I looked at minolta's thermo patents but I wasn't
able to find any formulas.
Do you have such formula?
Plus, I also searched for color filter gel spectras but didn't found it
either. That would definitely be an interesting spectra database.
thanks graeme
Matthieu DUBAIL
matthieu-dubail.com
Paris, 4ème
2011/10/18 Graeme Gill <graeme@xxxxxxxxxxxxx>
> Matthieu DUBAIL wrote:
> > I'm working in a small video postproduction company now. We're doing
> color
> > grading. Some clients ask color grader to match prints. Those prints were
> > made using the usual D50 standart profils. The light table used in the
> color
> > grading room is also D50. Should I replace the tube for a D65 tube since
> > REC709 (video standards similar to sRGB) are D65?
>
> Yes, you should create a calibration (and profile) that gives a
> visual match of the display white point with that of the prints,
> so that you do side by side comparisons. Note that typically
> it's good to match both the color and brightness of the white
> point. Measuring the white point under their illuminant of the
> prints can be a good start to getting the aim point, but don't
> be afraid to tweak it for best visual match.
>
> Graeme Gill.
>
>
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