Generates an SHA-256 message digest

# Gmagick::getimagesignature

(PECL gmagick >= Unknown)

Gmagick::getimagesignature — Generates an SHA-256 message digest

### Description

public Gmagick::getimagesignature(): string

Generates an SHA-256 message digest for the image pixel stream.

### Parameters

This function has no parameters.

### Return Values

Returns a string containing the SHA-256 hash of the file.

### Errors/Exceptions

Throws an GmagickException on error.

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