Here's what I do:

1. Your table should have a field of type File, I will assume that that is pointing to an image
2. In the show view, drag a Field into your canvas
3. Click on the field in the canvcas, the settings should come up on the right
4. In the settings, for the field drop-down choose the field with the File type
5. In the Field view drop down, pick "Show Image"
6. Remember to save by either pressing the save button or clicking next and continuing the dialog

Hope this helps!