(PECL imagick 2, PECL imagick 3)
Imagick::setFormat — Sets the format of the Imagick object
format
成功时返回 true
。
You can only set format listed in $imgic->queryFormats() .
It can be different from http://www.imagemagick.org/script/formats.php .