Hope these screenshots will explain Binuscan Photoretouch Pro 8 grayscale conversion methods

These JPEG images are tagged with sRGB profile for web viewing.

This is the original RGB (I did run Auto Process RECO on it):



The Grayscale Conversion screen:



Green (RGB) method



Intensity method



Lightness/Destaurate (HSL) method



Median method



Luma (Ycc) method



Luminance (Lab) method



Adaptive Luminosity method



Classic (bCP) method



Which one you prefer?

Anyway, those interested in PhotoRetouch Pro, a demo can be downloaded from here.

P.S. Sorry it's available on Mac only for now.