[darkpuppet]

Well, the problem is that phones (and even digital SLRs) can't see color as accurately as we can. So you'd be better off going by eye.

Or better yet, see if plasti dip will mix a custom color to the Pantone of your choosing. Pantone (and RAL) exist for this exact reason.

Just remember, if you need to use more than one can, make sure you start mixing in your second can early so any color deviations are averaged out a little.