It zooms so you can see closer, but the feature is made only to have a closer look and work more carefully with the pixels. Make sure you are in 1x zoom when planing what size the sig will be. The max sig size in tip it is 300x150, go to Image>Attributes, then change the height to 150 and lenght to 300. Not saying im any good or anything but yea i agree with him i always do my sigs in 200-600 and after everyting i draw i go back to normal to see how it does.