Tennis Shoe Drawing

OK, that's a smart way of reminding me that eight weeks ago I promised you to be back with some easy-to-use tool helping you to assess colors of your not-exactly-monochrome pictures.
It's not like I forgot, actually I was not happy with neither solution I checked and I postponed the discovery until something new would appear.
But this prompt makes me suggest a toll what is not ideal but at least small, freeware and portable - it does not need an installation (does not clutter the Registry). You are a Windows user, right?
If yes, the tool is there:
annystudio.com/software/colorpicker

Here is a screenshot of the tool hovering over your picture (after a clicked a point under the shoe sole)

I have chosen HSL (Hue, Saturation, Lightness) mode instead of typical RGB to see Saturation immediately (instead of comparing red, green and blue).
What does it tell us now? Look at the numbers just under the box placed at the top left corner of the tool window.
60° is yellow (as classic as yellow can be).
92% means the yellow color is almost not diluted, almost pure.
95% means that is very light. That's why you perceive it as very light gray.
Unfortunately saturation is so strong that the result is definitely yellow, not black and white.
Sorry...

Now if you invoke the tool and hover your mouse pointer over the long box filled with a black and white gradient at this moment you'll see that every gray shade there has 0% saturation. Lightness is changing from 100% (white) to 0% (black) and hue is 0° - red by default but it doesn't matter as saturation is 0%.