Delta E: The Color Difference
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What are Multi baggers? Quick Links for Delta Corp. Reproduction of news articles, photos, videos or any other content in whole or in part in any form or medium without express written permission of moneycontrol. By breaking the error into its components you can sometimes get a feel for what might be causing the error. If the tolerance region for dE76 is described as a round sphere, then dLab is a square cube.
My favorite variation on this idea is delta-LCH. If d-Lab is a box-shaped region then d-LCH is a wedge - like cutting a piece of a flat round ring or washer.
The interesting thing about d-LCH is what it can tell you about inkjet behavior. Different LCH values can refer to different problems, for instance:. As the eye's sensitivity to hue, chroma, and then lightness differ, the tolerance region around each color that contains acceptable color matches is best represented by an rugby ball-shaped ellipsoid.
The more modern color difference formulae use this ellipsoid shape and allow you, the user, to vary several different parameters to tune the numbers to match visual comparisons. Intended for the textiles industry, CMC l: As the eye is more sensitive to chroma, the default ratio for l: There is also a 'commercial factor' cf which allows an overall varying of the size of the tolerance region according to accuracy requirements.
It also has ratios, labeled kL lightness and Kc chroma and the commercial factor cf but these tend to be preset in software and are not often exposed for the user. Delta-E is the first major revision of the dE94 equation. Since this article was written, dE has become the industry standard formula to use.
I realize that this article is one of the more technical that I have written but delta-E is one of those topics that is worth understanding, and it can take a little work. I have also simplified the daylights out of some of my explanations.