Tuesday, October 4, 2011

Reaction: Imaging Vector Fields Using Line Integral Convolution

This paper presents a rather in-depth discussion of several techniques for rendering vector fields. More importantly, it discusses the utility of such techniques, but only, it seems, in processing of already constructed vector fields. The interesting thing about this paper is that, written in 1991, it provides an early view of what would later be high quality tools for imaging software such as Jasc’s Paint Shop Pro, and Adobe’s Photoshop. The techniques discussed translate well to science imaging as an efficient process, but it’s applicability truly lies in the realm of photo manipulations. What I would like to know is, how is the data generated that can create a gradient of an image in a local field? That is, what decides what is a positive and negative value in the calculation of the vectors?