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Nascent Drama

In order to produce exact colors the color red needs to be defined in terms of an absolute color space such as sRGB.
 
As used in computer monitors and television screens, red is very variable, but some systems may apply color correction (so that a standardized "red" is produced that is not in fact full intensity of only the red colorant).
 
A red filter used in black and white photography increases contrast in most scenes.
 
For example, combined with a polarizer, it can turn the sky black.
 
Films simulating the effects of infrared film (such as Ilford's SFX 200) do so by being much more sensitive to red than to other colors.
 
Red illumination was (and sometimes still is) used as a "safelight" while working in a darkroom, as it does not expose most photographic paper and some films.
 
Though many more modern darkrooms use an amber safelight, red illumination is closely associated with the darkroom in the public mind.
 
In astronomy, stars of stellar class M (the stars with the coolest temperature) are classified as red stars.
 
Mars is called the Red Planet because of the reddish color imparted to its surface by the abundant iron oxide present there.
 
Astronomical objects which are moving away from the observer exhibit a red shift.
 
Jupiter's surface displays a Great Red Spot, a football-shaped area south of the planet's equator.
 
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