Are you talking about when you are uploading an image to the gallery here? If so, then you will need to resize the image. The max is 1024 and 350K. One of the things you want to do also, if preparing an image for the web.... is resample it (cropping is the easiest way to do this, even if you crop it to full size) to 72 dpi. For printing you want 200-300 dpi, but 72 is ideal for viewing on the web. And, if you do any sharpening then do it last... after resizing.