SelectiveColour

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Abstract
Author wonkey_monkey
Version 2011/10/08
Download selectivecolour.zip
Category Levels and Chroma
License Closed source
Discussion Doom9 Thread

Contents

Description

SelectiveColour - AviSynth implementation of Photoshop's selective colour adjustment.

Requirements


Syntax and Parameters

selectivecolour (clip, float, float, float, float, float, float, float, float, float, float, float, float, float, float, float, float, float, float, bool)


clip   =
Input clip; must be RGB32.


float   =
This filter partially copies the actions of Photoshop's "Selective colour" image adjustment action. Apart from an input clip it takes 19 arguments.
The first 18 are floats in the range -1 to 1 (other values are accepted, but that behaviour is not well defined).
These are in groups of three, representing the Cyan, Magenta, and Yellow %ages (normalized) present in Photoshop's Selective Color dialogue for each of the six colour sections (reds, yellows, greens, cyans, blues, magentas).


bool   =
Boolean to choose either relative (false) or absolute (true) mode, as per the Photoshop dialogue box.


Note: all parameters are unnamed and do not have a default so they must be specified.


Examples

Usage:

AviSource("blah.avi")
ConvertToRGB32()
selectivecolour(last,\
0.5,0,0,\
0.25,0.1,0,\
1,-0.5,-0.25,\
-0.5,0.5,-0.5,\
0.1,0.2,0.3,\
-0.1,-0.2,-0.3,\
true)


The six triples act on the following sets of pixels (a pixel may be a member of up to 2 adjacent sets):

  • Reds: those pixels where R>G and B
  • Yellows: R and G>B
  • Greens: G>R and B
  • Cyans: G and B>R
  • Blues: B>R and G
  • Magentas: R and B>G

The first number in a triple alters the Red channel, the second the Green channel, the third the Blue channel. Because Photoshop calls these values Cyan, Magenta and Yellow, the numbers work backwards - if you want to increase the intensity of a channel, use a negative number, and vice versa.

The filter doesn't currently implement the "Black" value in Photoshop.


Changelog

Version      Date            Changes
2011/10/08 - The filter's now written a bit better, doesn't suffer from pitch problems, and is multithreaded. 2009/12/10 - Initial release.


Archived Downloads

Version Download Mirror
2011/10/08 selectivecolour.zip selectivecolour.zip


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