ANSI/NIST-ITL 2-2008 - National Institute of Standards and ...

Part 2 ANSI/NIST-ITL 2-2008
213.1.4 Element
All of the remaining elements in the Type-8 record are nested within, as described in the
subsections below.
[. . . Signature image, or vectored data elements . . .]
213.1.4.1 Element
Cross-reference: Part 1, Section 13.1.8.1 and 13.1.8.2: Signature image data (DATA), scanned
images
If the (SRT) element is “0” or “1”, this element is
mandatory. This element shall not appear in a record if
(SRT) element is “2”.
This element shall contain all of the data from a scanned signature image. The binary image data
shall be converted to ASCII characters using the Base64 encoding algorithm.
Uncompressed scanned image data
If the (SRT) contains the value “0”, then this element
shall contain the uncompressed scanned binary image data for the signature. In uncompressed
mode, the data shall be packed at eight pixels per byte.
Compressed scanned image data
If the (SRT) element contains the value “1”, then this
element shall contain the scanned binary image data for the signature in compressed form using
the ANSI/EIA-538-1988 facsimile compression algorithm.
base64 data
213.1.4.2 Element
This mandatory complex element contains the single child element described in the subsection
below.
[. . . Image capture elements . . .]
213.1.4.2.1 Element
Cross-reference: Part 1, Section 13.1.5: Image scanning resolution (ISR)
This element is mandatory. It shall contain an ASCII “0” if the minimum scanning resolution is
used and an ASCII “1” if the native scanning resolution is used. An ASCII value of “0” shall also
be used if the image is vector data.
47