- NAME
- SYNOPSIS
- FUNCTION DESCRIPTIONS

- SignatureImage

# NAME

signature - Methods to Compute a Digital Signature for an Image

# SYNOPSIS

unsigned int SignatureImage( Image *image );

# FUNCTION DESCRIPTIONS

## SignatureImage

> SignatureImage() computes a message digest from an image pixel stream with an implementation of the NIST SHA-256 Message Digest algorithm. This signature uniquely identifies the image and is convenient for determining if an image has been modified or whether two images are identical.

The format of the SignatureImage method is:

> unsigned int SignatureImage ( Image *image );

A description of each parameter follows:

o image:
  The image.