There are two equivalent ways to re-calibrate a profile. daily, weekly, or monthly), or when any of the consumables change (when a printhead or ink tank is replaced, or sometimes when the batch or even roll of substrate change), or when environmental conditions change significantly (ambient temperature and especially humidity). Re-calibration is recommended on a periodic basis (depending on use and requirements, e.g. This is the purpose of re-calibration, as described below. The ICC profile we generated is relative to a fixed calibrated state, so as long as we can maintain that state, the ICC profile does not need to be updated. Once we have calibrated and profiled a media definition, all we need to do is to re-calibrate it from time to time, in order to maintain color accuracy and consistency. The process for first time calibration and profiling described above is relatively lengthy and complex, but fortunately it needs to be executed only once for each new (copied) media profile. The process can then be completed for each printer, through the profiling step, as explained later in this document. The resulting aim set of Cyan, Magenta, Yellow and Black maximum densities must be applied to both printers. The resulting aim values of maximum densities can optionally be further reduced by some percent to provide 'head room' to compensate for drop volume variation and other factors that can impact maximum densities for re-calibrations. one set from the HP Designjet L26500 and one set from the HP Designjet L25500), create the desired new aim set by choosing for each process channel the smaller value from the two printers. Having both sets of maximum densities noted (i.e. It requires running the present procedure as described only up to this point in both printers being color matched (an L26500 and an L25500), first, before continuing on any of them. Rather than determining new aim values as a percentage of the maximum densities on a single printer, it requires the knowledge of the maximum densities of process channels of both printers being color matched. A more complex method provides the best possible compromise between color matching and gamut loss.

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