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During the telerecording process, it was normal practice to insert a filter circuit between the colour video output and the black-and-white monitor input in order to remove the colour signal and prevent the formation of chroma dots. In many cases, however, the filter was not used and the chroma dot patterning is permanently burned into the ...
Hence, IBM documentation lists the 80-column text mode as a "feature" only for RGBI and black-and-white composite monitors. [37] Stable color can still be achieved by setting the border color to brown, which happens to produce a phase identical to the correct color burst signal and serves as a substitute for it.
Monochrome monitors are commonly available in three colors: if the P1 phosphor is used, the screen is green monochrome. If the P3 phosphor is used, the screen is amber monochrome. If the P4 phosphor is used, the screen is white monochrome (known as "page white"); this is the same phosphor as used in early television sets. [2]
Bits 7–4: 000 = reserved Bits 3–2: White point x value least-significant 2 bits Bits 1–0: White point y value least-significant 2 bits 7: White point x value most significant 8 bits (like EDID byte 27) 8: White point y value most significant 8 bits (like EDID byte 28) 9: datavalue = (gamma − 1)×100 (1.0–3.54, like EDID byte 23) 10 ...
Some modern monitors and video cards support reduced blanking, standardized with Coordinated Video Timings. [3] In the PAL television standard, the blanking level corresponds to the black level, whilst other standards, most notably some variants of NTSC, may set the black level slightly above the blanking level on a pedestal or "set up level".
Contrast ratio is the ratio of the luminosity of the brightest color (white) to that of the darkest color (black) that the monitor is capable of producing simultaneously. For example, a ratio of 20,000∶1 means that the brightest shade (white) is 20,000 times brighter than its darkest shade (black).
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For simplicity, consider the example of a monochrome CRT. In this case, when a video signal of 0.5 (representing a mid-gray) is fed to the display, the intensity or brightness is about 0.22 (resulting in a mid-gray, about 22% the intensity of white). Pure black (0.0) and pure white (1.0) are the only shades that are unaffected by gamma.