[quote user="Phil1923"]1. How do you measure "accuracy". 2. What accuracy do you require. 3. How do you measure "values of the Color Proof should match with the printed values". [/quote] 1 - That's the reason for what thay use spectrodensitometers. 2 - This question is for each printing company, not for me. If the company follow some international standards (such as ISO 9000 / 9001) they should follow some steps and have tolerance values, but not all company follows the same levels of quality. Of course, a 100% exactly match is not always possible, but 90/95% it will be a good result. Most of the times, prnting company only requires to have an exact match of the values, such as 60% magenta should be printed as 60% magenta (maybe 58% / 62%). If the logo should have C:0 M:60 Y:40 K:0, it should be printed with those values, no matter if you see it as "pink", "orange", "sand"."peach" or any other color. It's not about human perception, it's about CMYK values. 3 - Color Proofs include frequently color samples and control stripes. That means a square with "100% cyan", "100% magenta", "100% cyan+magenta", etc according with those valuies. you could calibrate the rest of the image only based on the control samples..Anyway.they could use the content, specially on plain areas, It's more difficult to use a photography [quote user="Phil1923"]We all have personal opinions on color matching. If you want to give lessons, you will have to supply some numbers and how you got them.[/quote] This is not my personal opinion about color matching. I just talk about how printing companies work.
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