Although Photoshop is most used in 3D pre- and post-processing, the tutorials mentioned below are wel suited for GIMP, PaintShop Pro and similar image creation and management packages.
At the moment I can offer you:
- Changes and Additions – to the series.
Each serie comes as a chain of online posts as well as a single downloadable PDF, which are kep in sync. Information and insights that came up after publication of a serie is presented here, until the series and accompanying PDF get an update themselves.
Each reference below links to the first post in the series. From there you can easily select any individual post (footer, right).
- Poser Render Passes
On how to render aspects of an image (color, shine, reflection, …) separately, and how to combine them in Photoshop to a highly controllable final result. Never do in 3D what can be done in 2D, and this series of posts leads the way.