An image forming device includes: a toner image forming unit that forms a toner image onto a recording medium; a controlling unit that controls the toner image forming unit such that a test image is formed on the recording medium; a sheet transfer unit that transfers the recording medium having the toner image formed thereon by the toner image forming unit; a fixing unit that fixes the toner image formed by the toner image forming unit onto the recording medium; an image detecting unit, disposed downstream from the image fixing unit along the sheet transfer unit, that detects the test image formed on the recording medium; and a calibration unit that performs a color calibration process based upon the test image detected by the image detecting unit.

 
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< Image compressor for generating predicted difference code having fixed bit length by requantizing with coarser quantization steps

> Image data compression device and encoder

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