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e. Calibrating monitors and printers The calibration of monitors and printers is the last step in minimising device-dependent issues which inhibit the inter-comparison and interpretation of multispectral images. All the efforts invested into the collection of these images according to the optimised and standardised acquisition protocols (Chapter 2) and their calibration and correction using the post-processing methodology (Chapter 3), are perilously in vain if the means of visualising these images (typically on a screen or as print-outs) have not themselves undergone calibration. It should be noted that even in the case of linear images (as used in the postprocessing software), a gamma function is always finally applied to visualise them on a screen. The calibration of such devices is beyond the scope of this work, but affordable and accessible solutions to the problem of colour managing these resources are becoming increasingly available.’* The reader is therefore encouraged to refer to the AIC Guide to Digital Photography and Conservation Documentation’? and references contained therein for a more detailed consideration of this topic. Version No. 1.0 180 Date : 14/10/2013
