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Simple easy to use effect to recreate the 2-strip color process used by Technicolor about a hundred years ago in the silent movie era. Parameters include a "gain" to adjust the color, contrast and saturation. Use this effect with Aged Film (provided with FCPX) to create an old color film effect.
Available from:
https://fcpxtemplates.com/product/technicolor-2-strip-process/
and on Creative Market:
https://creativemarket.com/sight-creations/789385-Technicolor-2-Strip-Process-Effect