This is kind of round-about, but it works for me:
When a customer complains about color matching, the first thing I do is a simple cleaning and color calibration. This test pattern is very handy to identify flaws in CMYK. See below:
Then if it's still not close enough, I'll connect my laptop to the MFP and get a copy of the enduser's document. If it's not in a format that I can open, I'll use a PDF conversion of that document.
1) I'll open the document and confirm with the enduser that I've identified the color that they are concerned with matching. Using ColorPic I can identify the CMYK description of that color in the electronic document, i.e. CMYK:50/40/30/20
2) Next I print the document with PCL6 and PS3 drivers. Using my Pantone Color Bridge I find the closest match and compare the CMYK description.
3) If it matches (or close), then it's time for the business cards. Ask each person in the office for a business card and set them all on the table side by side. Typically you'll see four or five shades of similar and some totally dissimilar colors. "So which is the official color? There are 5 choices here." Your keyop will choose a sample and say "This is it." or they might say "It's none of these. I'll get you one." Compare the sample to your Pantone Color Bridge, and determine the closest CMYK description, i.e. CMYK:55/45/35/25.
4) Open a Paint document, and create a color patch that matches the endusers official sample (55/45/35/25). Along side of that create a patch of the color in step #1 (50/40/30/20). Print it, and confirm that both colors appear as they should using Pantone Color Bridge.
5) So you say "OK, so the color in this electronic document as you can see here is CMYK:50/40/30/20. and the machine prints CMYK:50/40/30/20. And your official color is 55/45/35/25 per the Pantone Color Bridge. If that color was in the electronic document it would print it, like this sample I created in Paint. All we need now is your official color to appear in this document."
You can also throw out there that just because a document is printed in ink, or came from a professional printer, that does not necessarily make it a good example of their official color. The business cards demonstrate this.
Notice how I've completely side-stepped the topic of Additive (RGB) versus Subtractive (CMYK) color. When pressed about the monitor versus print issue, the line I like to use is: "When they invent electronic light producing paper, then copies might look like your monitor. For now, copy paper is reflective, not refractive." Naturally there are ways of calibrating your monitor to more closely match refractive colors, but almost noone goes to that trouble. =^..^=
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