MediaWiki:Apihelp-query+allimages-param-prop/en

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Which image information to get:

timestamp
Adds timestamp for the uploaded version.
user
Adds the user who uploaded the image version.
userid
Add the user ID that uploaded the image version.
comment
Comment on the version.
parsedcomment
Parse the comment on the version.
canonicaltitle
Adds the canonical title of the image file.
url
Gives URL to the image and the description page.
size
Adds the size of the image in bytes and the height, width and page count (if applicable).
dimensions
Alias for size.
sha1
Adds SHA-1 hash for the image.
mime
Adds MIME type of the image.
mediatype
Adds the media type of the image.
metadata
Lists Exif metadata for the version of the image.
commonmetadata
Lists file format generic metadata for the version of the image.
extmetadata
Lists formatted metadata combined from multiple sources. Results are HTML formatted.
bitdepth
Adds the bit depth of the version.