(PECL gmagick >= Unknown)
Gmagick::setimageformat — Sets the format of a particular image
public Gmagick::setimageformat ( string $imageFormat ) : Gmagick
Sets the format of a particular image in a sequence.
imageFormat
The image format.
The Gmagick object on success.
Throws an GmagickException on error.
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https://www.php.net/manual/en/gmagick.setimageformat.php