(PECL imagick 2 >= 2.3.0, PECL imagick 3)
Imagick::encipherImage — Enciphers an image
Converts plain pixels to enciphered pixels. The image is not readable until it has been deciphered using Imagick::decipherImage() 此方法在Imagick基于ImageMagick 6.3.9以上版本编译时可用。
passphraseThe passphrase
成功时返回 true。