'imagick solid background not colorizing

trying to assign a black background to this thumbnail while it is being scalled. It always produces a white background even when I change the RGBA values... What am I doign wrong?

$imagick->setbackgroundcolor(new ImagickPixel( "rgba(0,0,0,1.00)" ) );
$imagick->thumbnailImage(200, 200, true, true);
$imagick->writeImages(ABSROOT.'/thumbs/'. $fileID.'_Small.jpg' ,true ); ```


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