Stouffer 21 Step Step Wedge

Discussion in 'Talk About Digital Scanning' started by Ian-Barber, Feb 4, 2017.

  1. Ian-Barber

    Ian-Barber Administrator Staff Member

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    I am conducting some tests with the Epson V800 scanner to see if I can ascertain it's minimum and maximum values in which it can resolve information from a black and white negative.

    The following is a low resolution version of the scanned step wedge which I scanned as a linear file (gamma 1.0) in VueScan and then converted it to gamma 2.2 for viewing.

    Each step of the step wedge represent 1/2 a stop and as far as I can make out, I can see tonality from step 2 up to and including step 16 which indicate that the scanner can extract an 8 stop range.

    The first step is film base which has a K value measured in Photoshop of 97% and step 16 has a K value of 8%

    Stouffer-21-Step-Wedge-Linear-copy.jpg
     

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