Instruction manual

Guppy PRO Technical ManualV4.1.0
115
Description of the data path
Hue and saturation
Guppy PRO CCD and Guppy PRO F-503 color models are equipped with hue and
saturation registers.
The hue register at offset 810h allows the color of objects to be changed without
altering the white balance, by +/- 40 steps (+/- 10°) from the nominal percep-
tion. Use this setting to manipulate the color appearance after having carried
out the white balance.
The saturation register at offset 814h allows the intensity of the colors to be
changed between 0 and 200% in steps of 1/256.
This means a setting of zero changes the image to black and white and a setting
of 511 doubles the color intensity compared to the nominal one at 256.
Color correction
Why color correction?
The spectral response of a CCD is different from those of an output device or the
human eye. This is the reason for the fact that perfect color reproduction is not
possible. In each Guppy PRO camera there is a factory setting for the color cor-
rection coefficients, see chapter GretagMacbeth ColorChecker on page 116.
Formula 4: Bayer demosaicing
Note

Configuration
To configure this feature in feature control register:
See offset 810h on page 204 and 814h on page 204.
Note

Configuration
Hue and saturation do not show any effect on Guppy PRO color
models in the Raw8 and Raw16 format, because color process-
ing is switched off in all Raw formats.
P1
red
R1=
P1
green
G1 G3+
2
-------------------
=
P1
blue
B1=
P2
red
R2=
P2
green
G1 G4+
2
-------------------
=
P2
blue
B1=
P3
red
R2=
P3
green
G2 G4+
2
-------------------
=
P3
blue
B2=