The Pixelmator Team (http://www.pixelmator.com) has announced Pixelmator 3.1 Marble, an update to its image editing app for Mac OS X. Version 3.1 adds support for 16-bit per channel images on the new Mac Pro and a new option for ordering prints.

It leverages the full power of the dual workstation-class GPUs built into it, says Saulius Dailide of the Pixelmator Team. Both graphics cards are used simultaneously to accelerate composition rendering and compute demanding tasks.

The Pixelmator Team also partnered with MILK Print on Demand to offer a new Order Prints feature. You can now turn your images into prints. With just a few clicks, you can order Pixelmator images as postcards, notecards, gallery frames, or posters and have them delivered right to your door.

Pixelmator 3.1 Marble requires Mac OS X 10.8.5. It’s available from the Mac App Store for US$29.99. Version 3.1 is a free upgrade for all existing customers who purchased the app from the Mac App Store.