Noise, ISO and Dynamic Range Explained

This article examines the noise characteristics of a modern digital camera. The primary spec used to specify the noise performance of a camera is Dynamic range (DR). Most expositions on DR tend to get highly technical very quickly. OK, this article gets technical here...

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Figure 3:  Gamma level histograms with logarithmic vertical axis.

A Better Histogram

The photo-histogram is probably the most ubiquitous exposure tool in digital photography; that is, short light metering itself.  It has been with us more than 25 years, and it hasn’t changed much.  The histograms we are familiar with are calculated from transformed...

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