Hi, I am trying to produce a world file (.tfw) for my tif image for use with php/map server. The image is x pixels by y pixels. I am unsure what the values would be for the first and 4 value. ? 0 0 ? 90 -180 All the help on the internet has not made it clear to me. I will appreciate a "non-mathematic" help....not that clever! s.