Problema con le trasparenza

[skill83]

Salve Ragazzi ho un problema con questa parte di un mio programma:

case 3:
                                //PNG
                                $immagine = date("dmyHis").".png";
                                $image_p = imagecreatetruecolor($finalsizew, $finalsizeh);  
                                $image   = imagecreatefrompng($file['tmp_name']);
                                imagecopyresampled($image_p, $image, 0, 0, 0, 0, $finalsizew, $finalsizeh, $width, $height);
                                imagepng($image_p, $file['tmp_name']);  
                                imagedestroy($image);
                                imageDestroy($image_p);
                                break; 

come potete vedere sto creando una immagine png ridimensionata solo che al posto della trasparenza mi viene un colore nero e non so come fare...

Sapete aiutarmi?

[telegio]

non saprei come usarlo, ma hai provato con imagecolortransparent ?

[skill83]

anche se inserisco

$immagine = date("dmyHis").".png";
$image_p = imagecreatetruecolor($finalsizew, $finalsizeh);  
$image   = imagecreatefrompng($file['tmp_name']);
imagealphablending($image, true); // setting alpha blending on
imagesavealpha($image, true);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $finalsizew, $finalsizeh, $width, $height);
imagepng($image_p, $file['tmp_name']);  
imagedestroy($image);
imageDestroy($image_p);
break; 

sempre nero

[telegio]

vedo che hai usato
imagealphablending e
imagesavealpha
non imagecolortransparent()

lo hai provato e non funziona?

[skill83]

case 3:
//PNG
$immagine = date("dmyHis").".png";
$image_p = imagecreatetruecolor($finalsizew, $finalsizeh);  
$image   = imagecreatefrompng($file['tmp_name']);
//imagealphablending($image, true); // setting alpha blending on
//imagesavealpha($image, true);
$black = imagecolorallocate($image, 0, 0, 0);
imagecolortransparent($image, $black);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $finalsizew, $finalsizeh, $width, $height);
//imagecolorallocatealpha ($image_p,0,0,0,75);
imagepng($image_p, $file['tmp_name']);  
imagedestroy($image);
imageDestroy($image_p);
break; 

non funge

[skill83]

Ragazzi ecco la soluzione per coloro che in futuro avranno questo problema futuro

case 3:
//PNG
$immagine = date("dmyHis").".png";
$image_p = imagecreatetruecolor($finalsizew, $finalsizeh);  
$image   = imagecreatefrompng($file['tmp_name']);
imagealphablending($image_p, false);
imagesavealpha($image_p,true);
$transparent = imagecolorallocatealpha($image_p, 255, 255, 255, 127);
imagefilledrectangle($image_p, 0, 0, $finalsizew, $finalsizeh, $transparent); 
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $finalsizew, $finalsizeh, $width, $height);
imagepng($image_p, $file['tmp_name']);  
imagedestroy($image);
imageDestroy($image_p);
break;