Resizing a png tranparent image.

Hello, I am trying to resize a png file, my autograph ;-) Good result thanks to gimp: http://boxfly.free.fr/test/test1.jpg Bad result with php: http://boxfly.free.fr/test/test2.jpg This is my PHP code to resize the autograph: $newAuto = imagecreatetruecolor( $widthImgAu, $heightImgAu) ; imagecolortransparent($newAuto,imagecolorat($newAuto,0,0)) ; $imgAuto = ImageCreateFromPNG($img_auto); imagecopyresized($newAuto, $imgAuto, 0, 0, 0, 0, $widthImgAu, $heightImgAu, $imageInfoAu[0], $imageInfoAu[1]) ; ImagePNG($newAuto,"new_auto.png"); So I tried: imagecopyresampled($newAuto, $imgAuto, 0, 0, 0, 0, $widthImgAu, $heightImgAu, $imageInfoAu[0], $imageInfoAu[1]) ; Instead of imagecopyresized... To copy the autograph inside the photo I do: $newImg = ImageCreateFromJPEG($img_des); ImageAlphaBlending($newImg, true); ImageCopy($newImg, $newAuto, $posX, $posY, 0, 0, $widthImgAu, $heightImgAu); But with no sucess If I do not resize the png autograph and copy it directly inside the photo, that's perfect, as a result the problem is the resizing... What do I have to do to resize a png image without loosing transparency ? Thanks.