Overview of features

Image Styles is a way to make an unlimited amount of beautiful graphic
images in a minimal amount of time. The main random seed algorithm,
placed in the heart of Image Styles allows to receive the different
images almost every second. You can make skins and icons for your
favorite programs, seamless backgrounds for your Web page, textures
for 3d-world, or almost anything else. Image Styles has more than
35 built in, ready-to-use commands including generators, deformers,
filters, colors adjustment, and more.

What are the differences between Pro and Standard editions?

ò You may make a large images with the size more than 256x256.

ò It is allowed the usual (not seamless) method of creation.  At this option
  an image becomes more complex and also decreases the time of creation.