My goal for this is to simply count the number of eggshells in the image.
Using color negate only leads to this
shell = Import["https://i.imgur.com/PZNt7JQ.jpg"]; binshell = FillingTransform[ColorNegate[Binarize[shell]]]
With luck, I at least came up with something clearer using
binshell = LocalAdaptiveBinarize[shell, 25];
What is the best way to count the total number of eggshells?