I was uneasy about my color selection for the little boy’s rubber boots — the part in shadow. The color constancy illusion would lead one to think the entire boot is yellow, but if you squint and then look at the photo, the boot in shadow is clearly not the same yellow as the boot in sunlight. So, at first I used a bluish-gray for the boot in shadow.

Then I remembered, I have the “Color Grab” app on my Android phone! I can check the suggested color, and then see if I have a pastel to match.

“Color Grab” showed the shadowed boot to be a yellow green, as shown in the first screen grab (see the small and larger white circles). Then you click on the Hex code for the color, and, if a listing of approximate paint colors is available, they will be listed. That display is what I used to approximate a pastel stick color.

I then added the yellow green color to the boot, but I need to blend it in.

In addition, the sunlit part of the boot is actually a whiter (paler) yellow, as shown by the screen grab, so I will need to adjust as appropriate there.