Available as an assembled Module and as a DIY project.
This Module is currently available.
RGB to Y - Grayscale Converter
This module takes an arbitrary color image (r,g,b) and calculates a grayscale image with the same relative luminance, Y. The colorspace ratio is specified by the international standard, BT.601.
Along with the Y output, the Red, Green and Blue inputs are buffered and an inverted Y is also provided.
*Current Consumption has been verified with the Joranalogue Test 3 V/mA Meter.
https://foxinghour.com/products/luma-rgb-to-y-greyscale-converter
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These merchants probably sell this module. Huh?
Foxing Hour LUMA - RGB to Y Greyscale
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Syntonie Entree