IRAF Tools for Color Image Display

Version : 4
Author(s) : Frank Valdes (
License : AURA
Website :

Installs from Open Source Astronomy for Mac OS X cd 2
Disk space required for installation is 1.20 Mb



A prototype IRAF color image display package, COLOR, is now available. Currently this package provides conversion of 3 bandpass IRAF images to a Sun 24-bit RGB rasterfile format, a 24-bit to 8-bit compression algorithm and Floyd-Steinberg dithering, and an RGB 8-bit pixel dithering algorithm. The Sun rasterfiles are displayed using non-IRAF tools and the others use only IRAF images and SAOimage or IMTOOL. These tasks are usable with the currently common 8-bit color workstations and are provided for those users which don't have more capable hardware such as 24-bit workstations, IIS displays, and 24-bit addon cards. Addtional functionality will be added to the COLOR package in time.

The task RGBSUN takes three input IRAF images and produces a 24-bit Sun rasterfile. Though this file type was developed by Sun Microsystems it is a relatively simple format which may useful on other machines having software designed to use it. The color image may be displayed with a variety of non-IRAF tools such as XV (a very powerful and generic viewer for X-window systems), XLOADIMAGE (another X-window display tool), SCREENLOAD (a simple displayer on Sun computers), and SNAPSHOT (an Open-Look tool). Also some color printers can be used with this format such as a Shinko color printer.