I'm following the Israh Tutorial to create a world map and regional maps from it. I'm at the stage where I need to export a png file showing the world's climate from FT. I'm saving the file as a 6000 x 3000 px image. However, when I open it in photoshop of an image viewer, what I see instead is a small image in the middle of a mostly empty 6000 x 3000 px layer. Any ideas as to what I'm doing wrong?