These JPEG are tagged with sRGB color profile for WEB viewing.
This is the original RGB, I did run Auto Process RECO on it but with no sharpening applied:

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

So, which one you like?
Those interested in PhotoRetouch Pro, a demo can be downloaded from here

