Re: nothces on the L* axis
Re: nothces on the L* axis
- Subject: Re: nothces on the L* axis
- From: "eugene appert" <email@hidden>
- Date: Wed, 12 Dec 2007 21:42:01 -0500
As long as there is no reference to real world visible distinctions I am not sure how the extra 2 decimal places would help a printer understand how data will transfer to density, which is sort of the promise of colour management. Of course there is soft proofing but the subject of this thread is the efficiency of L* values as they are displayed in Photoshop.
The disappointment I am trying to express with respect to the apparent inability of colour management to distinguish perceivable from nonperceivable variations in density goes to the heart of whether it can ever replace the leg work of test strips and step wedges.
A printer needs to know where tonal distinctions create lines and where they don't. I just printed out a linearization chart on Museo Silver Rag using a QTR grey profile and read it with an eye one. So now I know that L* 11 prints out at L*18.1 and L* 12 prints out at L*18.5. I could have just as easily converted the chart to the output profile in Photoshop and then read the L* values with absolute configured in my colour settings box. Even if the L* values had been expressed in two decimal figures, what's my reference for knowing whether or not the distinctions are important enough to produce a line? Should I expect to see a line between L* 1.1 and L* 1.2 ? between L* 16, 700, and 16, 720?
Eugene Appert
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