As a consequence, the ATSC digital television standard states that for i signals, SMPTE "C" colorimetry should be assumed unless colorimetric data is included in the transport stream. Color encoding[ edit ] For backward compatibility with black-and-white television, NTSC uses a luminance - chrominance encoding system invented in by Georges Valensi. The three color picture signals are divided into Luminance derived mathematically from the three separate color signals Red, Green and Blue which takes the place of the original monochrome signal and Chrominance which carries only the color information. This process is applied to each color source by its own Colorplexer , thereby allowing a compatible color source to be managed as if it were an ordinary monochrome source. This allows black-and-white receivers to display NTSC color signals by simply ignoring the chrominance signal.
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Guide to Real Photo Postcards This guide is meant to aid the collector in identifying and dating real photo postcards, and to act as a reminder that it is impossible to do so with great accuracy. Although real photo postcards were made in a variety of ways, they hold one identifiable feature in common. The tonalities of photos are completely continuous to the eye producing true greys, for they are created by the reaction of individual photosensitive molecules to light rather than the transfer of ink from a plate. In printed images the grey areas are usually made up of black marks that are spaced to create the optical illusion of greys. Though most of us today are familiar with the concept of photo grain, this is mostly because we have experienced very large prints made from small 35mm negatives.
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