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(PECL gmagick >= Unknown)
Gmagick::getimagesignature — Generates an SHA-256 message digest
Generates an SHA-256 message digest for the image pixel stream.
Bu işlevin bağımsız değişkeni yoktur.
Returns a string containing the SHA-256 hash of the file.
Hata durumunda bir GmagickException istisnası oluşur.