(ACC, Automatic Color Correction) A circuit found in many consumer viewing devices that attempts to compensate for the "Never Twice the Same Color" problems that have been found in broadcast quality. Depending on the implementation, this type of circuit can go far beyond the Auto Tint function. It changes color saturation as well as type of color. In most cases, where an ACC circuit is present, it can not be turned off. Adjusting the color and tint controls, using the SMPTE Color Bar pattern and the blue filter will result in a gross misadjustment of color level on the set. The color level may have to be reduced by as much as half the value calibrated with the SMPTE Color Bar pattern. VE T12 C1, VE T13 C3-5