The best way to tweak the pixel of the image that you will DWL is with Corel Photo Paint! I think it's the best soft to work with and the easiest.
EX:
As per resizing the image, i've been playing with the library in the Canestoga section for different color and finish and the best size is 512x512
See link for how to change the colors:
http://ntc.thermwood.com/forums/viewtop ... f=3&t=7023
I posted some example in the Customer Images and i'm trying some new colors so, play with the soft, you will be impress with the results that you can acheive in it!
By the way, if you don't have Corel, send me the attachment and i'll resample them for ya!
Francis
Au Vieux Bois Noeuds