.. _tweakreg: ********************************** TWEAKREG: Alignment of Images ********************************** Combining images using astrodrizzle requires that the WCS information in the headers of each input image align to within sub-pixel accuracy. The 'tweakreg' task allows the user to align sets of images to each other and/or to and external astrometric reference frame or image. .. automodule:: drizzlepac.tweakreg .. autofunction:: TweakReg .. autofunction:: help