Linear Camera Profiles in Adobe Lightroom

I have added an article about linear camera profiles in Adobe Lightroom.  Lightroom applies a hidden tone curve to the raw data in addition to the gamma encoding and any user modifications.  Some users, me included, would prefer that no such tone curve be applied.  This was supposedly achievable by using the new linear camera profiles.  Unfortunately, I found that some nonlinear tone curve is still applied to all photos.

Calibrating computer sound-system clock with GPS

I have added the article "Calibrating computer sound-system clock with GPS." Computer-based watch-timing systems require accurate sound-system clocks. This article shows a cheap and easy way to calibrate the clock.

Focus Stacking

I have a new article on focus stacking.  Focus stacking is needed when the object photographed is smaller than a certain size.  This size does not depend on the camera sensor size or the magnification.  This size (in units of the wavelength of light) is approximately equal to the number of pixels in the sensor.