Go to AppData=>Roaming=>Codemasters=>Clive Barker's Jericho and open Game.cfg file with wordpad (or any editor),
Change:
RT_HDRPostFX to "0" to disable crappy bloom. Game looks much better without it
R_ShadowMapsSize to "4096" for higher quality shadows (i recommend to increase it step by step: Increase to 1024, then to 2048. Everytime save changes, start/close game. Otherwise game may crash at launch)
R_Anisotropy to "16"
save changes