Archived posting to the Leica Users Group, 2004/04/19

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Subject: [Leica] Photoshop Questions
From: saganicc at MSKCC.ORG (Saganich, Christopher/Medical Physics)
Date: Mon Apr 19 08:26:27 2004
 
Can anyone explain the units used in the grey histogram, specifically the "Level", (O- 256) and how this might relate to opacity, density or luminescence from a densitometry or sensitometry perspective?  I can't see a relation but there should be one.  For example how does the 18% grey relate to the number 127?

Chris Saganich


 
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Replies: Reply from chmphoto at sbcglobal.net (Clive Moss) ([Leica] Photoshop Questions)