- NAME
- SYNOPSIS
- FUNCTION DESCRIPTIONS
  - SignatureImage

# NAME

signature - Methods to Compute a Digital Signature for an Image

# SYNOPSIS

SignatureImage( image );

# FUNCTION DESCRIPTIONS

## SignatureImage

Method SignatureImage computes a digital signature from an image. This signature uniquely identifies the image and is convenient for determining if the colormap of a sequence of images is identical when animating. The digital signature is from RSA Data Security MD5 Digest Algorithm described in Internet draft [MD5], July 1992.

The format of the SignatureImage method is:

> SignatureImage ( image );

A description of each parameter follows:

image:

  The address of a structure of type Image.