HiRise, the High-Resolution Imaging Science Experiment, is a camera on the Mars Reconnaissance Orbiter (MRO). HiRise is a project of the University of Arizona’s Lunar and Planetary Laboratory, LPL, in Tucson, AZ. The mission is to photograph the surface of Mars in...Read more
John SadowskyCharlestown, MD
John S. Sadowsky is a retired wireless system and signal processing engineer, with both academic and industrial experience. Now, I'm an amateur landscape photographer. I've done a lot of shooting in America's southwest, mostly in Arizona and southe...
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...Read more
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...Read more
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