For the GIMP users out there - a tutorial on different "conversion" techniques, and an example of why you might want to choose one (or more), over another or others. Seriously simple - seriously !_ It's a two to five minute "quicky"...

For the GIMP users out there - a tutorial on different "conversion" techniques, and an example of why you might want to choose one (or more), over another or others. Seriously simple - seriously !_ It's a two to five minute "quicky"...

the “standard” grayscale conversion operation.
the desaturate operation.
decomposing to RGB and using any one of the channels.
decomposing to HSV and using the Value (V) channel.
decomposing to LAB and using the Lightness (L) channel.
using the Channel Mixer filter.
https://www.gimp.org/tutorials/Color2BW/