I said equal. If know what you want to do, but dont know how to do it, then you get nothing done. If you know how to do something but dont know what to make, you get nothing done.
I think it involves more art. Example: A sig/wallpaper would look crappy if the colors aren't nice or just wierd and not what the person wanted to express. I think that skill would be how you add the color, but art would be the idea and what that color is. With just skill and no artistic qualities, it would be random effects slapped on. Putting together the right effects in the right places (ie knowing where to blend and brush) would look more attractive and meaningful. That is art in my eyes...
I voted equal even though I think it takes more skills but you need an artistic mind and vivid imagination.
i think its artistic knowledge to be honest, anyone can paint but it takes a genuis to make a masterpiece. It easy to learn adobe photoshop, i taught myself with about 2 months. And ive only had the full version for 2 weeks now.