Adobe Photoshop CS2 is such a common digital photography software that almost every computer users know it. It is to edit every digital photographs. However, you need some powerful tools or the so called plugins to turn it into an astronomical image editor.
Photoshop is not able to export an image file as FITS extension (.fits), commonly used between scientific organisations and now become popular among amateur astronomers who own decent imaging platform.
FitsPlug is written by Eddie Trimarchi to enable photoshop to export astronomical image in fits extension. You get the plugin by email and a lifetime upgrade for USD30. It worths the price. If you can’t afford it, you may opt for the free version which is no longer supported and updated. For more information regarding this plugin, please visit FitsPlug.
There is a second choice and it’s free! It’s the ESA/ESO/NASA Photoshop FITS Liberator v2.0. It can only support up to 16-bit FITS while FitsPlug can support up to 32-bit FITS. The difference isn’t obvious for amateur astronomers. However, I suggest you to experiment it yourselves. Its main page is here.
With either one of the plugins above, your Adobe Photoshop is now has the ability to export astronomical data in FITS.
