German: g vs. g

Hey guys, can anyone tell me how to figure the pronunciation of “ig” at the end of a German word? I had been doing it like “ich” in all cases, but I watched a video where a guy (Rainer Joswig, the Lisp programmer, as it happens) pronounced his name like “ik”.

Have I been doing it wrong, or is this just dialectical?

Interesting thread, i have another question.

For the "ch" sound, how do you if it is hard or soft?
I know it is dependent on the preceding vowel, but i've heard words like schlecht for example pronounced both ways