Introduction
For many years, I used an old-school X-rite 400 Reflection Densitometer to take readings of step-tablet prints, analog and digital, to calibrate negatives for Platinum/Palladium prints and other alternative photographic printing processes. Two or three years ago the densitometer suddenly stopped working. I had a DataColor Spyder3Studio SR kit that I had gotten to calibrate my monitor and printers for digital printing, but until that time I had never thought of it as a substitute for the densitometer.
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