DelogRGB
Function
This behaves exactly like DelogC,
except you can control the Red, Green, and Blue channels independently.
Parameters
|
Type
|
Defaults
|
Function
|
Offset |
float
|
0 |
These values offset the individual
color channels. |
black, white |
float
|
95, 685 |
These set the black and white cutoff points.
The default values are 95 and 685. |
NGamma |
float
|
.6 |
The film negative gamma. The default is
.6, as per the standard Kodak specification. Generally, this number
is not touched, unless you use a non-standard film stock. |
DGamma |
float
|
1 |
The display gamma to compensate for the
monitor's lookup table. By default, this number is 1. |
softClip |
float
|
0 |
The rolloff values on the white points.
Default is 0, which gives a Linear break. By increasing this value,
you smooth the curve out. |
Synopsis
image DelogRGB( image,
float rOffset,
float gOffset,
float bOffset,
float rBlack,
float gBlack,
float bBlack,
float rWhite,
float gWhite,
float bWhite,
float rNGamma,
float gNGamma,
float bNGamma,
float rDGamma,
float gDGamma,
float bDGamma,
float rSoftClip,
float gSoftClip,
float bSoftClip,
);
Script
image = DelogRGB( image,
rOffset, gOffset, bOffset,
rBlack, gBlack, bBlack,
rWhite, gWhite, bWhite,
rNGamma, gNGamma, bNGamma,
rDGamma, gDGamma, bDGamma,
rSoftClip, gSoftClip, bSoftClip
);
Command Line
shake -delogrgb redOffset greenOffset etc...
Example of the SoftClip
Create a horizontal 2-byte Ramp,
add a DelogRGB, and then attach a PlotScanline.
Push the SoftClip values up (say, around 20 or 30) to see the rolloff.
See Also
LogC , DelogC,
LogRGB
|