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If two colors are not the same...[the algorithm] may determine that the two colors are similar if they are within a configurable range, or a predetermined range, etc. For example, when the colors are represented as color values, server 120 may determine that two colors are similar if their color values are within 50 (or some other value) levels of color of each other.
Does changing the font-color of default black text on a #ffffff background to #dddddd de-emphasize the text for Google?
I don't think color implies emphasis in any fashion