(PECL gmagick >= Unknown)
Gmagick::setimagetype — Sets the image type
public Gmagick::setimagetype ( int $imgType ) : Gmagick
Sets the image type.
imgType
The image type: UndefinedType, BilevelType, GrayscaleType, GrayscaleMatteType, PaletteType, PaletteMatteType, TrueColorType, TrueColorMatteType, ColorSeparationType, ColorSeparationMatteType, or OptimizeType.
The Gmagick object on success.
Throws an GmagickException on error.
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https://www.php.net/manual/en/gmagick.setimagetype.php