Pixel
In digital imaging, a pixel, or pel, (picture element) is a physical point in a raster image, or the smallest addressable element in a display device; so it is the… Read More »Pixel
Vocabulary
Pixel density
Pixels per inch (PPI) or pixel density is a measurement of the resolution of devices in various contexts: typically computer displays, image scanners, and digital camera image sensors. PPI can… Read More »Pixel density
Dots per inch
Dots per inch (DPI) is a measure of spatial printing or video dot density, in particular the number of individual dots that can be placed in a line within the… Read More »Dots per inch
F-number
In optics, the f-number (sometimes called focal ratio, f-ratio, f-stop, or relative aperture) of an optical system is the ratio of the lens’s focal length to the diameter of the… Read More »F-number
Surface water
Surface water is water collecting on the ground or in a stream, river, lake, wetland, or ocean; it is related to water collecting as groundwater or atmospheric water. Surface water… Read More »Surface water
Henry Fox Talbot
William Henry Fox Talbot (11 February 1800 – 17 September 1877) was a British inventor and photography pioneer who invented the calotype process, a precursor to photographic processes of the 19th… Read More »Henry Fox Talbot
Heliography
Heliography (in French, héliographie) is the photographic process invented by Joseph Nicéphore Niépce around 1822, which he used to make the earliest known permanent photograph from nature, View from the… Read More »Heliography
Louis Daguerre
Louis-Jacques-Mandé Daguerre (18 November 1787 – 10 July 1851) was a French artist and physicist, recognized for his invention of the daguerreotype process of photography. He became known as one of… Read More »Louis Daguerre
35 mm film
, is the SDDS soundtrack as an image of a digital signal. Between the perforations is the Dolby Digital soundtrack (note the tiny Dolby “Double D” logo in the center… Read More »35 mm film