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maxCLL is calculated correctly following the SMPTE recommondations #13

@erazortt

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@erazortt

I want to point out that the processing done by this plugin follows the official recommendation what concerns MaxCLL. No weighting is necessary so the following should be removed from the readme:

For MaxCLL I simply took the brightest channel of any pixel in any of the frames. There may be some weighting necessary akin to what was done here: https://github.com/HDRWCG/HDRStaticMetadata

Sources:
Chapter E.2.3 of:
https://www.murideo.com/uploads/5/2/9/0/52903137/study_group_on_high-dynamic-range-hdr-ecosystem.pdf

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