Change of the chrominance amplitude (i. e. chrominance gain) as function of luminance level. Synonyms: DG
Differential gain is how much the color saturation changes when the luma level changes (it isn't supposed to). For a video system, the better the differential gain -- that is, the smaller the number specified -- the better the system is at figuring out the correct color.
Variation in the gain of the chrominance signal as the luminance signal on which it rides is varied from blanking to white level.
The variance in gain of the chroma signal measured in relation to the luminance level.
In color TV, the change in gain, expressed in dB, for the 3.58 MHz color sub-carrier as the level of the luminance signal is varied from blanking to white.
A change in sub-carrier amplitude of a video signal caused by a change in luminance level of the signal. The resulting TV picture will show a change in color saturation caused by a simultaneous change in picture brightness.
Unwanted variations in a video signal's chrominance subcarrier's amplitude that result from changes in the signal's DC level, usually specified between 10% and 90% of full scale. Expressed in a percentage, or a fraction of a percentage.
Important measurement parameter for composite video signals. Not applicable in Y/C or component signals. Differential gain is the amount of change in the color saturation (amplitude of the color modulation) for a change in low-frequency luma (brightness) amplitude. Closely approximated by measuring the change in the amplitude of a sine wave for a change in its DC level.
(DG): A type of distortion in a video signal that causes the brightness information to be incorrectly interpreted.
