Re: NEC 2490WUXi
Re: NEC 2490WUXi
- Subject: Re: NEC 2490WUXi
- From: Koch Karl <email@hidden>
- Date: Wed, 16 Jan 2008 16:54:24 +0100
Hello Andrew,
either your Artisan calibration is way off, or I envy you for your
twenty-twenty vision ;-)
Below you find the L* values for monitor calibrations with different
tonal response curves for RGB values of 1, 2 and 3 and the RGB values
that lead to a recognizable L* value (based on the assumption that a
DeltaL* of 1 is just recognizable).
A difference of 1 RGB in Black results in DeltaL*:
With a Gamma 2.2 calibration: DeltaL* = 0.00
With a Gamma 1.8 calibration: DeltaL* = 0.04
With a Gamma 1.5 calibration: DeltaL* = 0.22
With a Gamma 1.0 calibration: DeltaL* = 3.54
With an LStar calibration: DeltaL* = 0.39
A difference of 2 RGB in Black results in DeltaL*:
With a Gamma 2.2 calibration: DeltaL* = 0.03
With a Gamma 1.8 calibration: DeltaL* = 0.15
With a Gamma 1.5 calibration: DeltaL* = 0.63
With a Gamma 1.0 calibration: DeltaL* = 7.08
With an LStar calibration: DeltaL* = 0.78
A difference of 3 RGB in Black results in DeltaL*:
With a Gamma 2.2 calibration: DeltaL* = 0.06
With a Gamma 1.8 calibration: DeltaL* = 0.30
With a Gamma 1.5 calibration: DeltaL* = 1.16
With a Gamma 1.0 calibration: DeltaL* = 10.38
With an LStar calibration: DeltaL* = 1.17
So, the first safely visible difference from RGB 0 will be:
With a Gamma 2.2 calibration: RGB 11 (DeltaL*= 0.9)
With a Gamma 1.8 calibration: RGB 6 (DeltaL*= 1.06)
With a Gamma 1.5 calibration: RGB 3 (DeltaL*= 1.16)
With a Gamma 1.0 calibration: RGB 1 (DeltaL*= 3.54)
With an LStar calibration: RGB 3 (DeltaL*= 1.17)
All values calculated with 8 bits accuracy which should be ok for
assessing a monitor.
Best regards,
Karl Koch
Am 15.01.2008 um 20:20 schrieb Andrew Rodney:
The only unit I've used that visually produced a difference between
zero and
1 is my Artisan.
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