Is there some trick to getting PHP GD to properly convert a 24bit PNG [with alpha] into a JPEG without garbling the image output?

The below will output the jpg image, but it appears that the alpha channel from the original png is garbling the jpeg a bit To no avail, I tried setting imageAlphaBlending and imageSaveAlpha to 'false' and 'true'
I also tried setting the jpeg quality to 90 and 100.

$image_output = "myimage.jpeg";
$image = imagecreatefrompng($original_24bit_png_image);

imageAlphaBlending($image, true);
imageSaveAlpha($image, true);

header("Content-type: image/jpeg");
imagejpeg($image,'',100);
imagedestroy($image);


many thanks in advance
g

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