AstroBuffer is a CCD astrophotography image
manipulation application. It can open FITS and
SBIG (st9) files. Contrast is adjustable to view
different backgrounds and ranges of an image. It
can scale, shift, rotate, and zoom in and out.
Images can be aligned based on two star alignment,
and can be summed, subtracted, averaged, and
divided. RGB color images can be created from
three images. Images can be saved as FITS or as
any format that QT supports.