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ImgCalib gets the input raw image, subtracts pedestals and normalized background, apply applys the gain factors and mask, and saves the corrected image in the event.

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• ImgCalib uses the source and key_in parameters to get the input raw image (as ndarray<double,2> object),
• gets the calibration parameters from files fname_peds, fname_bkgd, fname_gain, and fname_mask, if their names are specified,
• the specified by the file name corrections are applied per-pixel to raw data as follows:
  {{ A_cor = (A_raw - pedestal - N*background) * gain (*apply) mask}},
• corrected image is saved in the event with key key_out.

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