I remember seeing some posts recently about the Track palette, so I thought I would post some notes I had made about it. This is for Photoshop, but maybe someone has done similar things with Paintshop?
The whole track has a single palette. It is trackpodname.act. If you are using Traxx 1.2, you get a copy of Tpark.act from Farmroad. In Traxx 1.4, you can select any of the stock track's palettes, or let Bill's palette generator make a custom one for you.
With Photoshop, you can see what your new custom texture is going to look like with a given palette, by converting it to Indexed Color Mode, and applying that specific palette to it, instead of letting Photoshop calculate a new one for you. There is probably a similar method using PaintShop.
With your texture opened up in Photoshop in RGB color mode, from the Menu select Image -> Mode -> Indexed Color. A dialog box pops up asking if you want to "Flatten Layers", so say yes. Then, the Indexed Color Dialog box pops up. In the Palette selection box, select Custom, then the Color Table Dialog box pops up and shows you the "Custom" generated palette for your texture, BUT, don't use that one. Instead select "Load" and go find your podfilename.act palette. For Tpark.pod, its Tpark.act hehe. Then you will see a new palette, like the two below, and you just "OK" out of the Color Table and Indexed Color Dialog boxes. Your texture will now "adjust" to how it is going to appear in the game.
You can remain in Indexed Color Mode and do some editing, and the colors will be the same as you will see in the game. You can see in the two palettes below, the one on the left is from Farm Road, on the right, Breakneck. Even though the terrains and colors on those two tracks are very different, the palettes are surprisingly similar. Perhaps some of the brighter colors near the end or beginning are for the trucks and are the same in every track?
http://www.qnet.com/~kwj/boardpics/palet.jpgIf you have trouble getting that special shade of purple to show up in a track, it may be because it is not in the track palette. I have "picked" colors right out of the track palette before when I had trouble getting a certain blue to show up.