Hi Ross, Thanks for the compliment. Every reply here is OFF TOPIC ! The original post had absolutely nothing to do with offset printing. Posting that it is not relevant to the printing industry is like posting that it will not help anyone to fly an airplane., Colorimetry -- i.e. representing a mix of colors with three primaries -- is all over the place. You're using it every day when you turn on your monitor. You're using it every day when you pick a color space for a document. You're using it every time you pick a profile. It's used every time that you choose a color for your clothing. You're using it every time you judge the color of a car. You're using it every time that you specify the profile for a printing press (CMYK has three colors). etc. etc. etc. YOU USE COLORIMETRY EVERY TIME THAT YOU OPEN YOUR EYES. Your eyes have three color sensors -- red, green, and blue. I found it to be of considerable interest to know how these primaries got the CIE numbers attached to them. I found it of interest to know the difference between RGB, XYZ and Lab spaces. I'd like to know how the CMYK spaces are defined. It's of practical importance when mixing colors in DRAW. Is the yellow primary yellow or a mix of red and green. Admittedly, you can't eat it or ____ it, but it is of interest to me. I can think of one and only one application for photometry. That's for scientific purposes to get a permanent record of color on some object or getting the color spectrum of various light temperatures. Everything else is colorimetry -- three primaries. It of interest to me to know where the numbers came from. Phil PS: Nobody seriously suggested tracing sRGB numbers back to the original CIE measurements and then turning on mercury vapor arc tubes to see the color. The point was that color space numbering originated with the CIE experiment and so a color number is accurately identified without the use of inks, paints, etc. which can change with time.
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