FIELD: information technology.
SUBSTANCE: device includes an original image processing system and a gradation conversion unit, having the function of converting the gradation of received image data from the processing system. The system also enables to convert a number of image data bits and express pseudo gray scales before gradation conversion in a gray scale converted image. The gradation conversion unit is capable of changing the gradation conversion function and performing conversion processing on the image, wherein the gradation conversion unit adds and outputs a determination flag indicating whether the gradation conversion processing has been performed at the time of outputting the image data.
EFFECT: reduced component loss of a plurality of bits during one-dimensional super bit mapping processing.
7 cl, 8 dwg
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