OK... A Lil Help/Discussion On Game Art

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Red Ocktober

i've been living with loust looking tetures, and i would appreciate a lil open discussion on just how some of you better artist (you know who you are) get such nice clean looking textures and skins on your models...

i'd like to discuss three things in particular that i seem to be having trouble with...

1- nice sharp, hi res looking textures... sharp lines... do these have to be 1024x768 sized in order to look sharp and clean...

2-how do you guys/gals go about making a specular map... a diffuse map... and a parallax map... and what is the purpose of them...

3- what format do you use to export your textures... jpg, tga, png, dds... and why...

thx for all input... i'm going over stuff in books and fromt he web as we speak... i gotta learn all this in a day... or two :)

--Mike