Sharp pre-convert to Grayscale

[Wade-BuildOtto]

Why not use sharp to pre-convert to grayscale, then you only have a single 0-255 range to deal with?

[ajbogh]

Good question. If we converted to grayscale first then that would be an extra operation on the image for each frame rendered. We do have a feature for monochrome motion detection which ignores the RGB colors and just uses one channel. Using the RGB colors doesn't add too much complexity to the code and it does allow us to handle each individual wavelength's contribution.

https://github.com/ajbogh/nMotion/blob/master/src/lib/util.mjs#L35

If you happen to play with the code and find a better way to write the above function, then I'd be happy to include it!