Color agnosia
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Color agnosia ("agnosia" is Greek for non-knowledge) is a medical or psychological condition that prevents a person from recognizing colors even though the eyes are capable of distinguishing them. It is a specific form of agnosia and generally results from damage to the visual cortex, often in V4 (as opposed to most other kinds of color blindness, which stem from problems with the photoreceptors).
It is also known as "Central achromatopsia".
[edit] Notes
Color agnosia is different than color anomia, a condition in which a person can distinguish between colors but cannot connect those colors to their names.