Originally posted by emalvick If you are calibrating a monitor, I can't see where you would need the color checker chart?
I sympathise with the OP's pursuit because a hardware calibrator cannot always be fully trusted.
First, there is inter instrument disagreement (which appears to be higher among the Spyder products than the X-Rite products).
Second, different backlight technologies require different compensation for the particular filters used in colorimeters. Only a few calibrators (like the X-Rite i1 display Pro) support the interrogation of actual filter characteristics and the software has to be able to account for the data. If the calibration software isn't tailored to the calibration device
and the particular panel used in the monitor your calibrating, results won't be optimal.
Third, even spectrophotometers (the most expensive type of hardware calibrators) are not immune to certain backlight technologies. There are some CCFL panels with spectral spikes that can interfere with the limited resolution of a spectrophotometers yielding incorrect results.
Fourth, your eyes may not be well aligned with a CIE standard observer and hence calibration results may not always produce a correct perceptual result.
I have a monitor that regularly is calibrated to produce a green tint, with a number of calibration devices. Obviously, the devices see the monitor output as "more magenta" than my eyes do and hence compensate in a direction that is not needed. Before you conclude I'm colour blind, I have very good colour vision, even in the blues which males can be bad at. I don't have the same tint problem with other monitors either. I did notice, though, that depending on the software you use and the particular calibration settings you choose, sometimes you can calibrate a number of monitors (I have four displays I use all the time) so that they pretty much (but not entirely) look the same, but sometimes the monitors display pretty different renderings easily recognisable by surprisingly inconsistent white points.
In summary, I definitely recommend hardware calibration but it is not a guarantee for getting an entirely correct result.