but to answer the question of bumps,i do it this way... turn the image to greyscale,and depending on the pattern you may have to invert it,because the blacks recess and the whites raise up visually. so if you wanted the spots on the suit to stand out they would need to be a shade of white. does that explain it?(i tend to be bad at explaining things like this...lol)

Funny YouTube video of the week - Bu De Bu Ai