digital stops calibration

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I suggest the following: (Off the top of my head)

 

My take on a digital zone system

 

Use an off-white subject with fine texture. Like a bath sheet, taped up on the wall.

 

Set up a digital camera on a tripod about a meter away and take a reading off the towel.

Shoot an exposure at that reading it should give you zone 5 right?

 

Shoot, successively, in 1-stop increments, 5 stops down and 5 stops up. That will give you 11 stops of exposure range.  From these you can make up a greyscale in PS which increments at exactly 1-stop.

 

Don't do any image processing to the raw files. Or, I should say do the same to all of them.

 

Take a few readings, (INFO) find out how it relates to the 0-255 thang. You can plot it out.

See where detail disappears at each end etc.,

 

See what happens when you shoot JPG and compare.... etc., etc.,

 

 

h



Herschel Mair
Head of the Department of Photography,
Higher College of Technology
Muscat
Sultanate of Oman
Adobe Certified instructor
 
+ (986) 99899 673
 
www.herschelmair.com

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