A short guide that explains how to use FITS Liberator to convert FITS files to TIFF files for processing in Photoshop.
(PDF file, 1.7 Mb)
Creating a colour image with SPIRIT using Photoshop (from the SPIRIT 103 workshop).
(PDF file, 4.8 Mb)
The New Astro Zone System for Astro Imaging – a book by Ron Wodaski and provided free to authorised teachers and students using SPIRIT. (Zipped PDF file, 6.8 Mb, requires password to unlock)