I'd suggest that you put the image names in one table, the image catagories in another table, and have a 3rd table that just holds image_id's and catagory_id's.
Images - image_id, image_name
Catagories - catagory_id, catagory_name
img_cat_xref - image_id, catagory_id
This way you can get all image names that have a catagory of Comedy(1). Or all catagories that an image belongs to with a query like this:
SELECT i.name
FROM images i, catagories c, img_cat_xref x
WHERE i.image_id = x.image_id
AND x.catagory_id = c.catagory_id
AND c.catagory_name = 'Comedy';
or
SELECT c.name
FROM images i, catagories c, img_cat_xref x
WHERE i.image_id = x.image_id
AND x.catagory_id = c.catagory_id
AND i.image_name = 'My Image';
