Product thumpnail.

Hi.

When I want to choose a product image the thumbnail dosen't show the hole image. When I upload the image to media library the size is 2000?×?1147.
When I choose it for my product image it just shows the center of the image.
Can I make som changes so I can se the hole picture or just another part from the original size.

Best, Tim (I have some screenshots of the thumbnail)