wwp@yahoogroups.com:
Re: Java on PC/MAC (was Re: Origins of the Panorama view)
Peter McCready 2005-Jan-19 21:06:00
Hi all,
On a similar note, I recently upgraded my OS X version of GretagMacbeth's
Eye-One Match software for my Eye-One Display colour calibrator...
http://www.i1color.com/
...from 2.x to 3.x. Where 2.x suggested that I choose Gamma 1.8 for a Mac
and Gamma 2.2 for a PC, 3.x simply opted for Gamma 2.2 by default!
Now that I think about it, switching to Gamma 2.2 makes a lot of sense, even
if it did take over a week for my eyes to get used to the darker display!!
P.
On 19/1/05 6:30 pm, "Francis Fougere" <#removed#> wrote:
>> An issue that concerns me is the discrepancy between the default
>> gamma of Mac (1.8) and PC (2.2) monitors that causes images on the PC
>> to appear darker than on the Mac. Any suggestions, anyone?
>> --
>>
>> Uri Cogan
>
> Hi Uri
> Your gamma issues as described above have been discussed elsewhere on a
> different list server to which I belong to. I have copied the discussion
> below as I could not have explained it any better myself. I have been
> involved in getting photography to the ink on paper process for twenty years
> and I have found Andrew Rodney's advise to be spot on.
> Francis Fougere
>
>
> The following was copied from an other list server. For information about
> joining these lists or contact info please contact me at #removed#
>
>
>
> yo dudesz...
>
> i just had a very enlightening discussion for the good people at
> gretagmacbeth,
> where i was encouraged to change the Gamma of my Apple Monitor from 1.8 to
> 2.2...
>
> it was explained to me that the Gamma of 1.8 for your Apple monitor was
> first determined for an old Apple Laser Printer that no longer exists
> today...
> setting your monitor to a Gamma of 2.2 may more accurately represent the
> deep rich blacks that can be with todays modern desktop printers...
> talk to you soon...
> --
> Mark
> www.prorental.com
>
> Correct. The 1.8 gamma legacy is kind of dumb (especially in light of OSX
> when Apple could have just gone to 2.2). It does date back to gamma response
> of the old LaserWriter on a 1 bit display.
>
> Displays don't really have a gamma per say (they have a tone response curve
> which provide a measurement in gamma). Most LCDs and CRTs have a native TRC
> gamma of about 2.2. Certainly closer than 1.8!
>
> The farther you get to the native behavior of the display system, the more
> compensation has to take place at the video card LUT (Look Up Table). So
> with an 8-bit LUT (in nearly all cases), you're doing a lot more correction
> when you calibrate (force the display) into 1.8 than 2.2. The results are
> more banding and other issues.
>
> Mac users should do one of two things. First, calibrate to 2.2 not 1.8.
> Better yet is to measure the NATIVE gamma of the display and calibrate to
> that. It might be 2.1 or 2.2 or 2.3 or a fraction of that. 2.2 is close
> enough although with the Sony Artisan you can actually tell the software to
> aim for the specific and unique gamma of that display.
>
> Downside to this for Mac users is the OS "assumes" 1.8 so anything you view
> that's not ICC aware will look a bit dark. It's not a big deal. Photoshop
> will gladly handle the disconnect in gamma from the OS since it's using the
> display profile which "knows" how the unit was set.
>
>> setting your monitor to a Gamma of 2.2 may more accurately represent the
>> deep rich blacks that can be with todays modern desktop printers...
>
> The gamma here however doesn't play a role with the printer or output
> device. That's all handled by the output profile.
>
> Ah, the gamma of the working space and the display have no relation and
> don't have to match. The gamma of a working space is simply that, the input
> to output values of that color space. There's no reason why you can't aim
> for a gamma of 2.2 for the display and use a 1.8 gamma in a working space
> like that found in ColorMatch RGB or ProPhoto RGB. A 2.2 gamma in a working
> space is more perceptually uniform but that's not anything to really lie
> awake at night worrying about.
>
> Andrew Rodney
> http://digitaldog.net/
>
>
>
> ------
> The World-Wide Panorama
>
> For more information:
> -Visit the web site at http://GeoImages.Berkeley.edu/wwp.html
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--
Peter McCready
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