wp_generate_attachment_metadata() Output

gistfile1.txt

Array
(
    [width] => 612
    [height] => 792
    [hwstring_small] => height='96' width='74'
    [file] => 2012/lowercase-print-dn-letter-a-z.jpg
    [sizes] => Array
        (
            [thumbnail] => Array
                (
                    [file] => lowercase-print-dn-letter-a-z-120x120.jpg
                    [width] => 120
                    [height] => 120
                )

            [medium] => Array
                (
                    [file] => lowercase-print-dn-letter-a-z-231x300.jpg
                    [width] => 231
                    [height] => 300
                )

            [worksheet-thumbnail] => Array
                (
                    [file] => lowercase-print-dn-letter-a-z-200x320.jpg
                    [width] => 200
                    [height] => 320
                )

            [Mini Square] => Array
                (
                    [file] => lowercase-print-dn-letter-a-z-70x70.jpg
                    [width] => 70
                    [height] => 70
                )

            [Square] => Array
                (
                    [file] => lowercase-print-dn-letter-a-z-110x110.jpg
                    [width] => 110
                    [height] => 110
                )

        )

    [image_meta] => Array
        (
            [aperture] => 0 //(string) Set to the EXIF FNumber field.
            [credit] => //(string) Set to the first non-empty value found by looking through the following fields: EXIF Artist field, EXIF Author field, IPTC Credit field (2#110), IPTC Creator field (2#080)
            [camera] => //(string) Set to the EXIF Model field.
             => //(string) Set to a non-empty value of one of the following fields (see source code for the precise logic involved): EXIF UserComment field, EXIF ImageDescription field, EXIF Comments field, IPTC Description field (2#120)
            [created_timestamp] => 0 //(string) Set to the first non-empty value found by looking through the following fields: EXIF field DateTimeDigitized, IPTC Date and Time fields (2#055 and 2#060)
            [copyright] => //(string) Set to the first non-empty value found by looking through the following fields: EXIF Copyright field, IPTC Copyright field (2#116)
            [focal_length] => 0 //(string) Set to the EXIF FocalLength field.
            [iso] => 0 //(string) Set to the EXIF ISOSpeedRatings field.
            [shutter_speed] => 0 //(string) Set to the EXIF ExposureTime field.
            [title] => //(string) Set to the first non-empty value found by looking through the following fields: EXIF Title field, IPTC Headline field (2#105), IPTC Title field (2#005), IPTC Caption field (2#120) but only if less than 80 characters, EXIF ImageDescription field but only if less than 80 characters
        )

)