Sets the image-id field in the image file. The image
    identification usually holds a version number of the image, but
    can be used for any text to identify the generated image.

    Format

      IDENTIFICATION=id-name

1 - Option Values

 id-name

    The maximum length of the identification character string is
    15 characters. If the string contains characters other than
    uppercase and lowercase A through Z, the numerals 0 through 9,
    the dollar sign, and the underscore, enclose it in quotation
    marks.