SIMULATING COLOR DIFFUSION IN A GRAPHICAL DISPLAY

摘要

As described herein, an electronic device with a display screen may simulate the color diffusion that occurs in a physical painting process. For instance, the user may perform one or more actions that simulate a brushstroke on the display screen such as swiping a touch-sensitive area or dragging a cursor across the screen. The electronic device then calculates a geodesic distance between a pixel inside a region defined by the brushstroke and a pixel located outside this region based on the physical distance between the two pixels and a weighting factor that varies depending on whether an image boundary is between the two pixels. Based on the geodesic distance, the electronic device uses a color diffusion relationship that defines the effect of the color of the brushstroke on the pixel and a time delay controlling when the color of the brushstroke reaches the pixel in order to simulate color diffusion.

主权项

1. A method, comprising:
identifying a location in a display screen where a user action simulates a brushstroke; determining, based on the location of the simulated brushstroke, a geodesic distance between a first pixel in the location and a second pixel outside of the location in the display screen; and determining a contribution of a color associated with the simulated brushstroke to the second pixel based on a color diffusion relationship, the color diffusion relationship comprising (i) a color diffusion component defining, based on the geodesic distance, an effect of the color of the simulated brushstroke on a color of the second pixel and (ii) a time component providing, based on the geodesic distance, a delay between when the simulated brushstroke is identified and when the color associated with the simulated brushstroke affects the color of the second pixel.