LUTDeRainbow

Abstract
Author	Scintilla
Version	10/3/08
Download	LUTDeCrawl
Category	Rainbow & Dot Crawl Removal
Requirements	YV12
License
Discussion

Description

LUTDeRainbow, a derainbowing script by Scintilla.

Requirements:

- AviSynth 2.5.8 or later

- Supported color formats: YV12

Required Filters:

• MaskTools2 2.0a48+

Syntax and Parameters

LUTDeRainbow(clip input, float "cthresh", float "ythresh", bool "y", bool "linkUV", bool "mask")

cthresh float = 10.0

This determines how close the chroma values of the pixel in the previous and next frames have to be for the pixel to be hit.

Higher values (within reason) should catch more rainbows, but may introduce unwanted artifacts. Probably shouldn't be set above 20 or so.

ythresh float = 10.0

If the y parameter is set true, then this determines how close the luma values of the pixel in the previous and next frames have to be for the pixel to be hit.

Just as with cthresh.

y bool = true

Determines whether luma difference will be considered n determining which pixels to hit and which to leave alone.

linkUV bool = true

Determines whether both chroma channels are considered in determining which pixels in each channel to hit.

When set true, only pixels that meet the thresholds for both U and V will be hit; when set false, the U and V channels are masked separately (so a pixel could have its U hit but not its V, or vice versa).

mask bool = false

When set true, the function will return the mask (for combined U/V) instead of the image. Formerly used to find the best values of cthresh and ythresh.

If linkUV=false, then this mask won't actually be used anyway (because each chroma channel will have its own mask).

Examples

AviSource("Blah.avi")
LUTDeRainbow()

Changelog

  10/3/08: 
     - Fixed "cthresh" typos in documentation; killed repmode since I realized I wasn't using Repair anymore; finally upgraded to MaskTools 2.

  9/2/05: 
     - Suddenly realized this wouldn't work for YUY2 and made it YV12 only; 
       added linkUV option, to decide whether to use a separate mask for each chroma channel or use the same one for both.

  7/1/05: 
     - Added Y option, to take luma into account when deciding whether to use the averaged chroma; added ythresh and cthresh parameters, 
       to determine how close the chroma/luma values of a pixel have to be to be considered the same (y=true is meant to cut down on artifacts)

  6/24/05: 
     - Replaced whole mask mechanism; new mask checks to see that BOTH channels of the chroma are within the threshold from previous frame to next

  6/23/05:
     - Is this thing on?