In a liquid dispense system, camera images may be utilized to identify puddle edges of a liquid dispensed on a substrate. The camera image may be used to determine the percentage of puddle coverage and puddling non-idealities. The camera within a fluid dispense system may also be utilized to monitor the intensity of wavelengths reflected from a substrate during a spin coating step. The reflected intensity as a function of time as a substrate is spin coated may be used to monitor and characterize a spin coating process. The reflected intensity as a function of time may be compared to other substrates to identify substrate to substrate film thickness variations. The analysis may be based upon peaks and/or troughs of the reflected intensity as a function of time.