GSDF is the acronym for Grayscale Standard Display Function.  This is used to specify the response of monitors and printers.

The conversion from digital values to the luminance space for a monitor; or density space for a printer can be subject to drift, and aging, or infulenced by environmental factors.  To provide consistency and integrity; a standard (GSDF) is required as well as the means to calibrate a device to comply with it.

The DICOM Grayscale Standard Display Function (GSDF) standard exactly defines the mapping between JND and either luminance for softcopy monitors or density for film and other hardcopy media.

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