In several games I seem to be experiencing inappropriate colors in fog/"foggy lighting." These games are quite old, as I'm running them on an old system. Two prominent examples are Splinter Cell: Pandora Tomorrow and Anachronox.

I'm running a Radeon HD4670 AGP on WinXP 32-bit with P4 3.0 GHz, 1 GB RAM.

I think it may be related to a certain ATI or game setting. As I'm no expert on this kind of topic, I wonder if anyone knows what setting might cause such anomalies in fog.

In Pandora Tomorrow, lights that cast a "foggy" light emit a strange reddish glow (whey they shouldn't) and the lighting conditions change abruptly when you move the camera around, so apparently it's not only related to color but to "collision" as well, e.g., one minute the room is barely lit, I move the camera a few inches, and there's light all over the place.

Probably your old games use 16-bit dithering. It is no longer supporten on modern cards. You can do absolutely nothing about it.

CPU: AMD Phenom II X4 810 @ 3250MHz | RAM: Kingmax 2x2GB DDR2 800 @ 833MHz| MoBo: MSI K9A2 CF v1.0 (BIOS: 1.D)| GPU: Asus HD 6850 1024MB (DirectCu) @ 850/1100MHz | Display: Chili Green Vision L24FHD | PSU: PC Power & Cooling Silencer 750 Quad | OS: MS Windows 95 x64 Edition

CPU: Pentium 4 Northwood S478 @ 3200MHz | RAM: 1,5GB DDR 400| MoBo: Gigabyte GA-8S661FXMP-RZ | GPU: Abit Geforce Ti 4200 | Display: Dimarson 19" CRT | PSU: Noname 400W | OS: MS Windows XP Pro, Fedora 18