Thursday, August 20, 2009

Custom, Spot, Brand, and Pantone Colors - part 4 of 4

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3 comments:

  1. I recommend a DE'94 tolerance of < 1.5 for QC pass/fail on press OK match to target and also press run color control or variation during the run.

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  2. To Anonymous,

    I have to disagree with you.
    First, I think your tolerance is too tight. After all ISO 12647-2 allows a DeltaE of 5 for each of the 4 process colors. Also, I don't think you should use a blanket tolerance like 1.5 for all colors – a tolerance should be related to the specific target color since the eye accepts a wider variation with saturated colors than with neutrals and pastels. Lastly, some color systems, like Pantone, do not have CIEL*a*b* targets - the values included with software are there to help with CMYK simulations, they do not represent the color target. The target color is represented by a sample swatch or draw down which the press operator is expected to match with the spot ink that he is supplied. The press has very little control over color - it simply lays down a film of ink to a specific thickness/density. That is why high/low density targets are used.

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  3. In our company we have determined dE (cie76) of value 8. But we still have some problems on this tolerance. But I must say that we use over 400 spot (Pantone) colors from our base. It's very difficult because each color has his own peculiarity. We have most problems with uncoated paper/colors because of fading. It's also problem if you use different supplier of paper because brightness of paper is different what is especialy important if you use bright pastel colors which are pretty transparent.

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