User blog comment:Kida155/Useful Guide to Editing/@comment-3176288-20131005134614/@comment-1250011-20131005204140

I don't think there is, but there probably should be. I personally prefer the look of the item image that is in a clean box with transparent backgrounds (Iron Ore being an example). But when trying to make the image myself, I noticed that the inventory boxes in the game now are smaller and the colors bleed around the edges (dunno if this was due to a recent update or if it's my resolution). So it's actually very difficult to make a good looking item image.

I tried taking the placeholder image that's visible on some pages and putting the item's inventory sprite over it, but the sprite colors bleed as well. So.. it's unfortunate.

As it stands, I'd say anything but really horrid-quality jpgs is a good image. Someone else can always go and upload a cleaner image if they have one.