Zonemaster calibration using scanner as reflection densitometer
This question is primarily for those who are familiar with the calibration process of the RH Designs Zonemaster or Analyzer Pro enlarging meters.
I'm going through the above mentioned calibration process and I now have a bunch of test strips that need to be evaluated by comparing them the highlight and shadow tones on the provided reference tile. In other words, I need to identify which tones on my test strips come closest to matching the reference tones that came with the product.
My paper tone is slightly warmer than the tone of the tile adding another variable to fool my already easily fooled eye balls. I was thinking that I might be able to use my flatbed scanner to scan the test strips and tile and match the tones that way. Furthermore, I was thinking it might be possible to improve the calibration by determining intermediate tonal values. In other words, if the reference tone falls between two tones on my test strip, perhaps the scanner would allow me to find out what the intermediate value would be for purposes of fine tuning the calibration values a bit. My test strip tones are 1/4 stop apart, but the calibration values are in increments of 1/12th stop, permitting more precision.
Has anyone done this before? Does it make sense to use a scanner to quantify differences in density like this? My thinking is that it would have to be an improvement over just just eyeballing it. By using the scanner in gray scale mode, I would also be eliminating the possible subjective error introduced by the warm tone of the paper.