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Smi-transparencias em PNG ( Using GD )


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Estou a tentar fazer um tratamento a uma imagem, querendo preservar a transparência.

Uso o código:

$aSize = getimagesize($source);
$oImage = imagecreatefrompng($source);
$oTmpImage = imagecreatetruecolor($aSize[0], $aSize[1]);
$alphaColor = imagecolorallocatealpha($oTmpImage, 0, 0,0);
imagecolortransparent($oTmpImage, $alphaColor);
imagealphablending($oTmpImage, false); 
imagecopyresampled($oTmpImage, $oImage, 0, 0, 0, 0, $aSize[0], $aSize[1],$aSize[0], $aSize[1]);
Estou a conseguir preservar a transparência ( 0-1 range ), mas não as semi-transparências do png ( 0-100 range )

Alguém me pode dizer que burrisse estou eu a fazer? Obrigado

"Quando eu for grande quero ser como o Celso"

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