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Gamma, Ratio, & Sony Artisan
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Gamma, Ratio, & Sony Artisan


  • Subject: Gamma, Ratio, & Sony Artisan
  • From: email@hidden
  • Date: Wed, 08 Dec 2004 20:10:05 -0500

Hi to all,

There are two parts to this inquiry (try not to be long) – the first concerning a problem I ran into with a new Sony Artisan and the second concerning gamma and Kelvin settings on an Artisan.  First, while I was testing a new Artisan in making a decision on an upcoming purchase I found a problem: the test was to make the screen completely black (in Photoshop) then marquee a selection in the middle of the screen (copy/paste) and use the Curves dialog box to view subtle changes in black/gray movement.  Basically, I made the lower left curve point (black/black) active and using the “up arrow” looked for changes in the middle of the screen.  I read about this test from “Luminous Landscape” site.  With a very good monitor there should be distinct changes with each movement upward but with THIS Artisan (new) I noticed changes only every 2 movements – this is equivalent to my horrible 17” Apple Studio!!  What could be wrong?  This leads to the next inquiry….

Secondly, I contacted a colleague of mine and found we have a gentleman’s disagreement on gamma and Kelvin settings.  He suggested that the Artisan I ran this test on did not have the appropriate “contrast ratio” set – which might very well be the case but I would like members’ input on this.  He runs his Sony Artisan (with G5 Mac) with a contrast ratio of 500:1, a gamma of 2.2 (he states that Artisan native is 2.3), and a Kelvin rating of 6500 for viewing in a 5500 Kelvin booth.

I thought that Mac/graphic users should set gamma to 1.8 and I believe the native contrast ratio of the Artisan is 400:1 (not sure).  And should one not calibrate to the Kelvin rating of their viewing booth??  How does raising the contrast ration affect other factors?  I know that with Piezography a Kelvin rating of 5000 is recommended (thought 6500 was mainly press printing)??

I know this is long but, while not a color expert, I would like info as to where I, or my colleague, might be off in the understanding of appropriate monitor settings/calibration.

Thank you,

Cody Thomas
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