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#1
June 19th 08, 03:47 PM
posted to rec.photo.digital
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Raw values and exposure values
On Thu, 19 Jun 2008 05:47:17 -0700 (PDT), Marc Wossner
wrote: Dear ng, If I have a set of raw values, each 125 dn apart, and a signal to noise ratio for each of those values, is it correct to plot the base 2 logarithm of both dn and snr to show how the signal to noise ratio changes for each additional step of exposure? If you are plotting log2(dn), it would make more sense to collect data at ratio intervals of 2 or sqrt(2) or 2^(1/4) than at intervals of 125 dn. The low end will be really coarse and the high end really fine. -- John 
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