Response to Density step tablets (calibrate a scanner to be a densitometer)

Ryuji, Does this mean you are not wanting to know, in an artistic sense, where in a photographic image you want black and white and various in between shades? The computer will do it for you? Yes, you could write software that will do what most photo editing software does--sort through the image and pick out maximum and minimum. I am not usually happy with those results. I also do not own the full PhotoShop, I have the PhotoShop LE that came with one of my scanners. I still think you would learn to have fun with log paper. What young engineers do not know about old ways is a shame. I went to our local college library one day because I fell heir to an old oscilloscope that needed repair. It contained vacuum tubes that were not in any of my antique manuals, and I foolishly thought the college might have a manual somewhere in the archives. When I asked at the desk where I would find such a book, the attendant said "What's a vacuum tube?" Oh, well.

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