Overview ======== .. note:: `ccdproc` works only with astropy version 2.0 or later. The `ccdproc` package provides: + An image class, `~astropy.nddata.CCDData`, that includes an uncertainty for the data, units and methods for performing arithmetic with images including the propagation of uncertainties. + A set of functions performing common CCD data reduction steps (e.g. dark subtraction, flat field correction) with a flexible mechanism for logging reduction steps in the image metadata. + A function for reprojecting an image onto another WCS, useful for stacking science images. The actual reprojection is done by the `reproject package `_. + A class for combining and/or clipping images, `~ccdproc.Combiner`, and associated functions. + A class, `~ccdproc.ImageFileCollection`, for working with a directory of images.