Bit-Tech have posted a very sweet article and it's worth a read. It goes into some depth explaining HDR and what it will mean for HL2:
"HDR facilitates the use of colour values way outside the normal range in an effort to produce a more realistic rendering of a typical 3D scene. If you have ever driven through a dark tunnel in your car, and then emerged out the other side into blazing sunshine, temporarily blinded by the difference in light levels - that oversaturation is one example of what is possible with HDR"
Give it a read right here.











