Analog Devices ADV7850 Hardware Manual page 239

Function
vid_adj_en
0 
1
cp_contrast[7:0], Addr 44 (CP), Address 0x3A[7:0]
This control is used to set the contrast. It is an unsigned value represented in a 1.7 binary format. The MSB represents the integer part of
the contrast value, which is either 0 or 1. The seven LSBs represents the fractional part of the contrast value. The fractional part has the
range [0 to 0.99]. This control is functional if vid_adj_en is set to 1.
Function
cp_contrast[7:0]
00000000
10000000 
11111111
cp_saturation[7:0], Addr 44 (CP), Address 0x3B[7:0]
This control is used to set the saturation. It is an unsigned value represented in a 1.7 binary format. The MSB represents the integer part
of the saturation value, which is either 0 or 1. The seven LSBs represent the fractional part of the saturation value. The fractional part
has a [0 to 0.99] range. This control is functional if vid_adj_en is set to 1.
Function
cp_saturation[7:0]
00000000
10000000 
11111111
cp_brightness[7:0], Addr 44 (CP), Address 0x3C[7:0]
This control is used to set the brightness. It is a signed value. The effective brightness value applied to the luma is obtained by
multiplying the programmed value cp_brightness with a gain of 4. The brightness applied to the luma has a range of [-512 to 508]. This
control is functional if vid_adj_en is set to 1.
Function
cp_brightness[7:0]
00000000 
01111111
11111111
cp_hue[7:0], Addr 44 (CP), Address 0x3D[7:0]
This control is used to set the hue. This control represents an unsigned value which provides hue adjustment. The effective hue applied
to the chroma is [(cp_hue[7:0] * 180)/256 - 90]. The range of the effective hue applied to the chroma is [-90° to 90°].
Function
cp_hue[7:0]
00000000 
00001111
11111111
The effective hue applied to the Chroma is given by
Rev. A May 2012
Description
Disable color controls
Enable color controls
Description
Contrast set to minimum
Default
Contrast set to maximum
Description
Saturation set to minimum
Default
Saturation set to maximum
Description
Offset applied to luma is 0.
Offset applied to luma is 508d. This value corresponds to brightest setting.
Offset applied to luma is -512d. This value corresponds to darkest setting.
Description
Hue of -90° applied to chroma
Hue of 0° applied to chroma
Hue of 90° applied to chroma
Equation 9. The range of the effective hue applied to the chroma is [-90º to 90º].
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ADV7850