V-raptor™ 8k v v operation guide – RED DIGITAL CINEMA V-RAPTOR 8K VV DSMC3 Camera (RF, Black) User Manual

Page 72

SLOPE, OFFSET AND POWER

The three CDL tone curve parameters are Slope, Offset and Power. These algorithms allow the camera to modify the
recorded image.

Slope multiplies the incoming data
Offset is sum of the incoming data
Power is a power function to the incoming data

These three relate to Gain, Lift, and Gamma in the following ways:

Slope = Gain

Gain Adjusts highlights.
Offset = Lift

Lift Increases the value of dark colors.
Power = Gamma

Gamma adjusts midtones.

These three relate to each other in the following ways:

Slope= input x slope

Offset= (input x slope) + offset

Power= ((input x slope) + offset) ^ power

The formula for ASC CDL color correction is:

where

is the color graded pixel code value

is the input pixel code value (0=black, 1=white)

is slope (any number 0 or greater, nominal value is 1.0)
is offset (any number, nominal value is 0)

is power (any number greater than 0, nominal value is 1.0)

The formula is applied to the three color values for each pixel using the corresponding slope, offset, and power
numbers for each color channel.

SATURATION

A fourth parameter “Saturation” is achieved by converting the

out

data in a Luma and Chroma component. The Chroma

Signal is then multiplied by the “Saturation” parameter.

FILM GRADE AND VIDEO GRADE

With Slope and Offset you can produce both a Film Grade “Exposure” and “Contrast” and a Video Grade “Lift” and
“Gain”.

Exposure is achieved by Offset
Contrast is achieved by a combination of Offset and Slope
Gain is achieved by Slope
Lift is achieved by a combination of Offset and Slope
Gamma is achieved by Power

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V-RAPTOR™ 8K V V OPERATION GUIDE