The color blue (Cyan plus Magenta in the CMYK world) is not only one of the most-used colors in graphic design, it is also one of the colors in which the human eye can most easily see differences.
The blues used in corporate design...Pepsi blue, Morton salt blue, Quaker Oats blue....are easy to identify and each is unique. Too bad that blue can also one of the toughest colors to reproduce accurately.
It may not help that the blue solid defined in the G7 characterization data set could have an internal inaccuracy.
Equal parts of Cyan and Magenta have a characteristic purplish cast through the range from light to dark...untill you hit solid, when the a* value dips and the cast takes a definite bluish turn. The source seems to be the original ISO 12647 data set, which was used as the basis for G7. The ISO committee recanted at the last minute and shifted the a* values for the solid blue overprint up by a full 5 steps of a* value, but G7 held steady.
Which is right? Many report that the G7 blue looks fine, but more are finding that they have to hold back on magenta density to keep their blues from going more reddish than the proof.
The G7 committee is taking input on this and it looks like the color blue will be revisited soon.
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A running commentary on the world of color management, especially G7 and process control in all settings. We follow developments in the areas of offset printing, digital, large format, icc profiles, grand format and more.
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