Going to magenta sounds like BT.709 was used to convert to YUV and then BT.601 back to RGB.
Quote:
Originally Posted by Shiandow
Edit: Also note that there's no additional value whatsoever to perform sharpening in the original YUV, besides preventing unnecessary colour conversions.
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Sharpening in linear light (RGB or YUV) would probably be more valuable than any transformation between gamma-corrected RGB or YUV.