Handbrake: Please add a filter to remove Cross Color Artifacts (Rainbow Effect)

[mkikoen]

Describe the change or feature you'd like to see added to HandBrake:

Please replace this text with information about the feature request you'd like to see implemented and why.

Hello Development Team, your Handbrake application has been a very helpful, powerful, and extremely useful transcoding app to use. However, there is one crucial filter that the app unfortunately does not have. I would like if possible in the near future to have a filter to remove cross color artifacts (rainbow effect).

I am aware that separating the chroma and Luma both at once is a very difficult task that’s not easy, but if it is possible to create a filter to try to separate and remove those artifacts and restore the original color, that really would be massively helpful since that’s the only artifact I still have been unable to remove from a video source. I assume it’ll probably be a new filter that’s added under de-combing or something different since I’ve been able to reduce the appearance of Dot Crawl artifacts from a video source, I just haven’t been able to remove that annoying rainbow cross color artifact yet.

(I’m pretty sure Cross Color Artifacts is the correct term for what I’m describing, I hope. Unless I’m wrong).

Here’s a reference image to show you the color artifact:

System Specifications:
HandBrake Version 1.3.0
Macintosh OSX 10.13 High Sierra

HandBrake Activity Log (see https://handbrake.fr/docs/en/latest/help/activity-log.html)

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[bradleysepos]

The Chroma Smooth filter (see https://github.com/HandBrake/HandBrake/pull/1957) will likely solve this problem for you. Unfortunately, it's currently only available on the command line.

You can create a preset in the graphical interface and use it on the command line, adding the chroma smooth filter:

HandBrakeCLI -i source.mp4 --preset-import-gui --preset="My Preset Name" --chroma-smooth=medium --chroma-smooth-tune=medium -o destination.mp4

Chroma Smooth's presets are strength ultralight/light/medium/strong/verystrong and tunes are radius tiny/small/medium/wide/verywide corresponding to 3/5/7/9/11 pixels.

Hope this helps.

[mkikoen]

Thanks! @bradleysepos

This Chroma Smooth Filter will definitely help a lot ... if I’m able to successfully replicate those steps.

Unfortunately, I have no clue how to use a command line interface as I have no programming skills, so assuming I’m able to figure this out, hopefully I’ll be able to implement it following your steps provided.

If not, then I’ll just have to wait until this Chroma Smooth Filter is added to the GUI as soon as possible in the next update once it’s finished being tested. That’s what I meant to say.

This will definitely help eliminate those pesky analog color artifacts. I appreciate the help.