• Windows XP, Windows Vista, Windows 2000, Windows 7, 32-bit or 64-bit.   WINE (under Linux) works and is supported, and people use emulators with Macs.
• MMX/SSE2 (this is just about all computers)  -- Sagelight supports SSE4 when it is available.
• 512 Megabytes of RAM is required. 1 Gigabyte of RAM is recommended and is required for larger images and to use the Bokeh/Lens Blur and Fast Depth of Field functions.
• A screen size of at least 1024x600, though 800x600 or less works, too, but may be a little restricting.