(PECL imagick 2, PECL imagick 3)
ImagickDraw::getTextUnderColor — Returns the text under color
public ImagickDraw::getTextUnderColor ( ) : ImagickPixel
This function is currently not documented; only its argument list is available.
Returns the color of a background rectangle to place under text annotations.
Returns an ImagickPixel object describing the color.
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https://www.php.net/manual/en/imagickdraw.gettextundercolor.php