[argyllcms] Re: Scaling of XYZ reference data for camera input profile
- From: Gerhard Fuernkranz <nospam456@xxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Tue, 15 May 2012 18:09:03 +0200
Am 15.05.2012 16:27, schrieb Stephen:
I have an idea to improve highlights for a camera input profile: can I scale
XYZ data linearly to match an increase in exposure?
For example, +1 EV of exposure compensation = 2 x linear device RGB. Will XYZ
also increase by the same factor of two?
XYZ is a linear light space, so the numbers are expected to scale linearly with
intensity.
I would wonder though, how accurate various cameras can realize the prescribed
f-stops and shutter speeds, how well they are repeatable, and how uniform the
steps between different adjacent f-stops and shutter speed are distributed in
reality.
[ Maybe someone here on the list has experience regarding f-stop and shutter
speed accuracy of typical cameras and can give some numbers? ]
Best Regards,
Gerhard
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