[argyllcms] Re: Creating a camera profile with ColorChecker Passport Please Help

  • From: Graeme Gill <graeme@xxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Sat, 13 Jun 2015 11:22:45 +1000

Iliah Borg wrote:

That would be too high, because of how the sensors and electronics behave
(blooming,
non-linearities, pattern noise, pixel non-uniformity...). 70% is the safety
margin
(-0.5 stops from clipping), unless the camera is full-well limited at current
ISO
setting (like some Panasonics are). Generally auto-exposure in
center-weighted mode
+0.5 EV compensation puts the target right at the intended segment of the
characteristic curve.

Sounds like some of the camera makers a pushing their sensors too hard then -
there's no real reason for them to be in significant non-linearity at full
exposure.

70% of full scale should work fine for scanin though.

Graeme Gill.

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