Struct lsst::afw::fits::ImageScale¶
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struct
ImageScale
Scale to apply to image
Images are scaled to the type implied by the provided BITPIX using the provided scale and zero-point:
value in memory = BZERO + BSCALE * value in FITS
In addition to scaling, a random field of values distributed [0,1) may be added before quantisation (“fuzz”); this preserves the expectation value of the floating-point image, while increasing the variance by 1/12.