How much art is required to make texture patterns with the RealTexture Tools, versus how much is automated?
The difficulty varies case-by-case. If an image has a jumble of fine detail, it is generally easy to convert to a seamless pattern using the tools. However, imagine trying to convert an image of a sunset into a texture pattern. Tiling the image left-to-right might not be too difficult, but it would be impossible to match blue sky at the top with orange at the bottom to make a seamless pattern. Even if the pattern tiles easily, the result may not be pleasing. If a pattern of mostly-dark stones has one bright white stone, the tiled pattern will show an obvious grid of white dots. Unless an artistic effect is desired from the grid of white dots, the evident regularity is likely to be unacceptable. There are techniques for curing these problems using the tools in Photoshop along with the CGSD tools. A comprehensive illustrated manual is provided to teach you the techniques you will need to build even difficult texture patterns.