Escape Motions (http://www.escapemotions.com) has released Rebelle 1.5, an update to its watercolor and acrylic painting application for Mac OS X. Its watercolor simulation is based on a real-world color mixing, blending, wet- diffusion, and drying.

Rebelle mimics the way natural media interacts with the canvas and itself. Users can paint, smear, re-wet dried colors, blow wet washes across the paper, tilt the paper to create water drops and runs and create countless fantastic watercolor effects. Wet tools — watercolors, acrylics or ink pen — can be combined with pastels, pencils, airbrush many other dry-media tools and effects. Version 1.5 offers: new, more realistic paint blending for watercolors and acrylics; new options for watercolors and acrylic; touch gestures for Wacom, Surface and other tablets; and more.

Rebelle is available for $59.99 at the Escape Motions website. A demo is available for download; version 1.5 is a free upgrade for registered users.