Problem $2.($Particle Identification$)$ The first challenge is to identify the beads amidst the noisy data. Each image is $640-$by$-480$ pixels, and each pixel is represented by a Color object which needs to be converted to a luminance value ranging from $0\mathrm{.}0($black$)$ to $255\mathrm{.}0($white$).$ Whiter pixels correspond to beads $($foreground$)$ and blacker pixels to water $($background$).$ We break the problem into three pieces