Ah. Yea, I understand now.

I'm not sure if that'd be possible with how our images are displayed. Since images displayed are just png images, it'd be quite tricky (not impossible) to have it figure out the color of a selected pixel.

However, as others stated above, there are browser plugins that do this exact thing. I use one for Chrome called ColorZilla.

Alternatively, you could save your avatar to your Desktop, open it in an art program, and use the eye dropper tool from there too.