Saturday, March 1, 2008

TONE CURVES

Definition: A term for an adjustment available on certain scanners. Beginning as a 45° angle line running up to the right, this line is adjusted into a curve shape by the user to effect colour or tone correction. The lower left end of the curve typically represents the dark portions of a picture and an upward bend will typically lighten the shadows. Similar capabilities exist by working with the middle or highlight parts of the curve. In this way it is possible to alter only certain tone ranges of an image without making un-wanted changes in other parts of the image.


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