Digital Darkroom requires any color-capable Macintosh (68020 processor or greater) with 3MB of RAM and 30MB of hard disk space running System 7.0 or greater. A color monitor is recommended.
Please note that while Digital Darkroom will run under the Mac OS X operating system, it still is a Classic application and is not a native OS X program. It will run in Classic mode on PowerPC-based Macs, but will not run on Intel-based Macs or any Mac running OS X 10.5 (Leopard) as those do not support Classic mode.