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(PECL imagick 2, PECL imagick 3)
Imagick::getImageSignature — Generates an SHA-256 message digest
Generates an SHA-256 message digest for the image pixel stream.
У цієї функції немає параметрів.
Returns a string containing the SHA-256 hash of the file.
Кидає ImagickException в разі помилки.
