ImageMagick – MagickCore, C API: Compute a Message Digest for an Image
Description: ImageMagick is a free and open-source software suite used for editing and manipulating digital images. It provides a versatile set of tools for various image-related tasks. You can use ImageMagick to resize, convert, and apply various transformations to images. It supports a wide range of file formats, including JPEG, PNG, GIF, TIFF, and Ultra HDR.
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# Signature

## 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:

    MagickBooleanType SignatureImage(Image *image,ExceptionInfo *exception)

A description of each parameter follows:

image
  the image.
exception
  return any errors or warnings in this structure.