Re: Photoshop 5.5

[CDTobie@aol.com]

In a message dated 8/12/99 5:44:23 AM, james45667@layeredlens.com writes:

>So when you specify Adobe RGB, you keep the rest of what comes up:
>Gamma 2.2, White point 6500, and Primaries Adobe RGB (1998)?
>If you change one of those, the RGB box will then say Custom.  I assume
>that means that everything else stays the same.  So I was unsure previously
>when ColorMatch had been recommended, but a white point of 6500 had also
>been recommended, where ColorMatch's native white point is 5000.  It seems
>with all this variety possible, why can't I adjust my monitor the way it
>looks
>best to me visually, then use EZ to profile it?  I mean, if I reset to
>factory
>settings
>the monitor temp is 9300, for instance.  It's a Raster Ops/HItachi, 21",
>and they
>
>told me at Hitachi that the phosphors were EBU.  Mac's gamma is supposed
>to be
>1.8.
>All this stuff is conflicting.  Am I supposed to start with known parameters
>for
>my
>monitor and platform and then profile that to get what the monitor is 
actually
>doing,
>or can I just pick and choose from these things, which is kind of the end
>result
>from
>some of these RGB setups.  I'm confused!
>
First lets seperate monitor RGB from workingspace RGB. Your monitor may well 
be set to 5k or 6.5k without dictating a workingspace.  And depending on your 
monitor controls you may get the best calibration by leaving it "raw" (about 
9300, or presetting as close as possible to your final (best choice when it 
works properly).  For visual monitor calibrators they just want you to get 
things in the ballpark, so they can then allow you to adjust them visually. 
You need to leave all the other setttings alone to use a stock workingspace, 
and I would suggest against choosing one then changiong a single spec, like 
gamma. The only instance I know of where the gammas or the varying spaces 
conflict (and this is pretty indirect and exotic) is that SilverFast scanning 
software will set your default gamma to match the platform (1.8 for Mac, 2.2 
ofr PC) and if you attempt to profile the scanner with third party profiling 
software at 1.8 gamma on a Mac while using Adobe Gamma as a workingspace, you 
will get a very nonliniar response, which will not profile well.  So I set my 
scanner gamma to 2.2 to match the AdobeRGB workingspace and avoid unnecessary 
conversions in the process of moving the image to the workingspace (which can 
be done right in SilverScan). 

C. David Tobie
Design Cooperative
CDTobie@designcoop.com
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