Chroma Subsampling - History

History

Chroma subsampling was developed in the 1950s by Alda Bedford for the development of color television by RCA, which developed into the NTSC standard; luma-chroma separation was developed earlier, in 1938 by Georges Valensi.

Through studies, he showed that the human eye has high resolution only for black and white, somewhat less for "mid-range" colors like yellows and greens, and much less for colors on the end of the spectrum, reds and blues. Using this knowledge allowed RCA to develop a system in which they discarded most of the blue signal after it comes from the camera, keeping most of the green and only some of the red; this is chroma subsampling in the YIQ color space, and is roughly analogous to 4:2:1 subsampling, in that it has decreasing resolution for luma, yellow/green, and red/blue.

Read more about this topic:  Chroma Subsampling

Famous quotes containing the word history:

    Let it suffice that in the light of these two facts, namely, that the mind is One, and that nature is its correlative, history is to be read and written.
    Ralph Waldo Emerson (1803–1882)

    It is remarkable how closely the history of the apple tree is connected with that of man.
    Henry David Thoreau (1817–1862)

    The principal office of history I take to be this: to prevent virtuous actions from being forgotten, and that evil words and deeds should fear an infamous reputation with posterity.
    Tacitus (c. 55–c. 120)