A photo object describes a photo and contains the following fields:

id integer	photo ID.
album_id integer	photo album ID.
owner_id integer	photo owner ID.
user_id integer	ID of the user who uploaded the photo (if the photo is uploaded in community). 100 for photos uploaded by the community.
text string	description text.
date integer	date when the photo has been added in Unixtime

If photo_sizes = 1 parameter is passed, photo sizes are returned in a special format

photo_75 string	url of the copy with maximum size of 75x75px.
photo_130 string	url of the copy with maximum size of 130x130px.
photo_604 string	url of the copy with maximum size of 604x604px.
photo_807 string	url of the copy with maximum size of 807x807px.
photo_1280 string	url of the copy with maximum size of 1280x1024px.
photo_2560 string	url of the copy with maximum size of 2560x2048px.
width* integer	width of the original photo in px.
height* integer	height of the original photo in px.

* — field can be unavailable for photos has been uploaded before 2012.