Re: Photoshop 6/7 problems with OptiCAL Monitor profiles
Re: Photoshop 6/7 problems with OptiCAL Monitor profiles
- Subject: Re: Photoshop 6/7 problems with OptiCAL Monitor profiles
- From: email@hidden
- Date: Thu, 13 Feb 2003 09:55:01 EST
In a message dated 2/12/03 6:12:51 PM, email@hidden writes:
>
1) At least for my calibration target, D65/gamma 2.2, OptiCAL-produced
>
>
monitor profiles are NOT fully compatible with any version of Photoshop,
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and
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>
they haven't been for at least as far back as OptiCAL v2.5 for Windows,
>
>
where I originally checked.
Well, I refuse to dig out a CRT and a DTP92... but with an LCD and a Spyder,
here is what I get:
Little x and little y values as reported for Gamma 1.8 Whitepoint Native
(about 6500) or 6500 profiles with the EyeOne, the Spyder and OptiCAL and
Optix with the new Sequel calibrator compared to the colorant tags in the
profiles reported x, y values; all for the same monitor. All on a Mac, OS
9.2, Photoshop 7.
OptiCAL values vary from the Optix values in Photoshop by a maximum of .02.
Optix and OptiCAL vary from the EyeOne by a maximum of .04. This may be the
colorimeters siding together against the spectrophotometer.
The EyeOne and OptiCAL/Spyder values between Photoshop and the tag values are
accurate to the rounding errors (one reports more digits than the other),
while Optix varies from itself (Photoshop to tags) by a max of .02.
Note that these are all values well away from 5000k. They are quite similar
to the scatter I get measuring printed patches with a range of devices.
So your proposal that OptiCAL is doing something wrong could be viewed
instead as monitor calibration at large working in a way you don't care for.
C. David Tobie
Design Cooperative
email@hidden
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