GIMP is available for multiple systems not because its open source but because its developers care about developing it for Linux, Solaris, and BSD.
The reason Photoshop isn't available for those platforms isn't because it is proprietary, it's because Adobe realizes there's no market, and therefore no return on using resources for developing a version of Linux, Solaris, and BSD. Like all business decisions, this is a question of allocating resources and whether it makes a sufficient return for the risk. It's simply not worth hiring developers to make a Solaris version of Photoshop because there just aren't graphic designers who use Solaris.
The open group of GIMP doesn't run like a business and therefore is inefficient--they allocate resources not based on demand but on personal whim (these coders like alt OSes). So they spend a bunch of time developing apps that no one will use (Solaris version of Photoshop).
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GIMP is available for multiple systems not because its open source but because its developers care about developing it for Linux, Solaris, and BSD.
The reason Photoshop isn't available for those platforms isn't because it is proprietary, it's because Adobe realizes there's no market, and therefore no return on using resources for developing a version of Linux, Solaris, and BSD. Like all business decisions, this is a question of allocating resources and whether it makes a sufficient return for the risk. It's simply not worth hiring developers to make a Solaris version of Photoshop because there just aren't graphic designers who use Solaris.
The open group of GIMP doesn't run like a business and therefore is inefficient--they allocate resources not based on demand but on personal whim (these coders like alt OSes). So they spend a bunch of time developing apps that no one will use (Solaris version of Photoshop).