Photo Fits is still in development and right now it can only read in 2 dimensional images of: byte integer longint real & double. Photo Fits only looks at the first header, all other headers are ignored. Improvements will be made in later versions. If you are looking for an application which will allow you to do more processing and analysis of your fits images... take a look at MacPhase. MacPhase has a large assortment of analysis, processing, and visualization tools. Here are just a few... File Import/Export Fourier Transforms Windowing Frequency Filtering Simple Image Math (ie. + - * / ) Convolution Filters Support for Frame Grabbers Macro Language GPIB I/O Serial I/O External Code Support Photoshop Plug-in Support Plot using... Raster Contour 3D Wireframe 3D Surface 3D Rendered Surface Vector Line and combinations of plots. Check out the MacPhase demo located at various ftp sites, on AOL (use keyword "otter solution"), or contact: Otter Solution 10 Limekiln Road Whitesboro, NY 13492-2338 tel. 315.768.3956 fax. 315.736.4371