Hi If the first pixel of a fits-image like this: SIMPLE = T / Standard FITS format flag BITPIX = 32 / Bits per pixel NAXIS = 2 / Number of dimensions NAXIS1 = 496 / Row length NAXIS2 = 390 / Number of rows END at the top left corner or at the buttom left corner? -- Juergen Liesmann http://home.t-online.de/home/liesmann Email: liesmann at t-online.de