png afbeeldingen worden zwart
Code (php)
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<?php
if (isset($_POST['make_thumb'])){
$in_filename = $_POST['thumb_name'];
$in_filename =str_replace("_thumb","",$in_filename);
$ext = end(explode('.', $in_filename));
copy($dir.$in_filename,$dir.$in_filename = str_replace(".","_thumb.",$in_filename));
if($ext=="jpg" || $ext=="jpeg" )
{
$image = imagecreatefromjpeg($dir.$in_filename);
}
else if($ext=="png")
{
$image = imagecreatefrompng($dir.$in_filename);
}
else
{
$image = imagecreatefromgif($dir.$in_filename);
}
list($width, $height) = getimagesize($dir.$in_filename);
if ($height > $width){
$newwidth=$thumb_width;
$newheight=($newwidth*$height)/$width;
if($newheight < $thumb_height){
$newheight=$thumb_height;
$newwidth=($newheight*$width)/$height;
}
}
if($width == $height){
$newwidth=$thumb_width;
$newheight=$thumb_height;
}
if ($height < $width){
$newheight=$thumb_height;
$newwidth=($newheight*$width)/$height;
if($newwidth < $thumb_width){
$newwidth=$thumb_width;
$newheight=($newwidth*$height)/$width;
}
}
//hier wordt gekeken wat het type van het bestand is, jpg, jpeg, png of gif
$new_image = imagecreatetruecolor($newwidth, $newheight);
//hier worden de afmetingen van de thumb daadwerkelijk aangepast
imagecopyresampled($new_image,$image,0,0,0,0,$newwidth,$newheight,$width,$height);
/* Uncomment in case you want it also outputted
header('Content-Type: image/jpeg');
imagejpeg($new_image);
*/
imagejpeg($new_image, $dir.$in_filename,100);
?>
if (isset($_POST['make_thumb'])){
$in_filename = $_POST['thumb_name'];
$in_filename =str_replace("_thumb","",$in_filename);
$ext = end(explode('.', $in_filename));
copy($dir.$in_filename,$dir.$in_filename = str_replace(".","_thumb.",$in_filename));
if($ext=="jpg" || $ext=="jpeg" )
{
$image = imagecreatefromjpeg($dir.$in_filename);
}
else if($ext=="png")
{
$image = imagecreatefrompng($dir.$in_filename);
}
else
{
$image = imagecreatefromgif($dir.$in_filename);
}
list($width, $height) = getimagesize($dir.$in_filename);
if ($height > $width){
$newwidth=$thumb_width;
$newheight=($newwidth*$height)/$width;
if($newheight < $thumb_height){
$newheight=$thumb_height;
$newwidth=($newheight*$width)/$height;
}
}
if($width == $height){
$newwidth=$thumb_width;
$newheight=$thumb_height;
}
if ($height < $width){
$newheight=$thumb_height;
$newwidth=($newheight*$width)/$height;
if($newwidth < $thumb_width){
$newwidth=$thumb_width;
$newheight=($newwidth*$height)/$width;
}
}
//hier wordt gekeken wat het type van het bestand is, jpg, jpeg, png of gif
$new_image = imagecreatetruecolor($newwidth, $newheight);
//hier worden de afmetingen van de thumb daadwerkelijk aangepast
imagecopyresampled($new_image,$image,0,0,0,0,$newwidth,$newheight,$width,$height);
/* Uncomment in case you want it also outputted
header('Content-Type: image/jpeg');
imagejpeg($new_image);
*/
imagejpeg($new_image, $dir.$in_filename,100);
?>
<p>Thumbnail <b>created</b>.</p>
</div>
Code (php)
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<?php
}
}
Gewijzigd op 17/04/2012 15:23:42 door Ruben Koops
Quote:
By default, you will get black background if you resize a transparent image. To fix it, you need set alpha channel imagecolorallocatealpha to 127.
With imagecolorallocatealpha, it will allocate a color for an image.
With imagecolorallocatealpha, it will allocate a color for an image.
Thanks for the quick reaction, I tried to implement your sollution. Now i get a completely transparant picture, this is my code:
Code (php)
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<?php
if (isset($_POST['make_thumb'])){
$in_filename = $_POST['thumb_name'];
$in_filename =str_replace("_thumb","",$in_filename);
$ext = end(explode('.', $in_filename));
copy($dir.$in_filename,$dir.$in_filename = str_replace(".","_thumb.",$in_filename));
list($width, $height) = getimagesize($dir.$in_filename);
if ($height > $width){
$newwidth=$thumb_width;
$newheight=($newwidth*$height)/$width;
if($newheight < $thumb_height){
$newheight=$thumb_height;
$newwidth=($newheight*$width)/$height;
}
}
if($width == $height){
if($thumb_width > $thumb_height){
$newwidth=$thumb_width;
$newheight=$thumb_width;
}else{
$newwidth=$thumb_height;
$newheight=$thumb_height;
}}
if ($height < $width){
$newheight=$thumb_height;
$newwidth=($newheight*$width)/$height;
if($newwidth < $thumb_width){
$newwidth=$thumb_width;
$newheight=($newwidth*$height)/$width;
}
}
$thumb = imagecreatetruecolor($newwidth, $newheight);
//hier worden de afmetingen van de thumb daadwerkelijk aangepast
imagealphablending($thumb, false);
imagesavealpha($thumb, true);
$transparent = imagecolorallocatealpha($thumb, 255, 255, 255, 127);
imagefilledrectangle($thumb, 0, 0, $newwidth, $newheight, $transparent);
switch($ext){
case 'jpeg':
case 'jpg':
$image = imagecreatefromjpeg($dir.$in_filename);
break;
case 'gif':
$image = imagecreatefromgif($dir.$in_filename);
break;
case 'png':
$image = imagecreatefrompng($dir.$in_filename);
break;
}
imagealphablending($image, true);
imagecopyresampled($thumb, $image,0,0,0,0,$newwidth,$newheight,$width,$height);
/* Uncomment in case you want it also outputted
header('Content-Type: image/jpeg');
imagejpeg($new_image);
*/
switch($ext){
case 'jpeg':
case 'jpg':
imagejpeg($thumb, $dir.$in_filename);
break;
case 'gif':
imagegif($thumb, $dir.$in_filename);
break;
case 'png':
imagepng($thumb, $dir.$in_filename);
break;
}?>
if (isset($_POST['make_thumb'])){
$in_filename = $_POST['thumb_name'];
$in_filename =str_replace("_thumb","",$in_filename);
$ext = end(explode('.', $in_filename));
copy($dir.$in_filename,$dir.$in_filename = str_replace(".","_thumb.",$in_filename));
list($width, $height) = getimagesize($dir.$in_filename);
if ($height > $width){
$newwidth=$thumb_width;
$newheight=($newwidth*$height)/$width;
if($newheight < $thumb_height){
$newheight=$thumb_height;
$newwidth=($newheight*$width)/$height;
}
}
if($width == $height){
if($thumb_width > $thumb_height){
$newwidth=$thumb_width;
$newheight=$thumb_width;
}else{
$newwidth=$thumb_height;
$newheight=$thumb_height;
}}
if ($height < $width){
$newheight=$thumb_height;
$newwidth=($newheight*$width)/$height;
if($newwidth < $thumb_width){
$newwidth=$thumb_width;
$newheight=($newwidth*$height)/$width;
}
}
$thumb = imagecreatetruecolor($newwidth, $newheight);
//hier worden de afmetingen van de thumb daadwerkelijk aangepast
imagealphablending($thumb, false);
imagesavealpha($thumb, true);
$transparent = imagecolorallocatealpha($thumb, 255, 255, 255, 127);
imagefilledrectangle($thumb, 0, 0, $newwidth, $newheight, $transparent);
switch($ext){
case 'jpeg':
case 'jpg':
$image = imagecreatefromjpeg($dir.$in_filename);
break;
case 'gif':
$image = imagecreatefromgif($dir.$in_filename);
break;
case 'png':
$image = imagecreatefrompng($dir.$in_filename);
break;
}
imagealphablending($image, true);
imagecopyresampled($thumb, $image,0,0,0,0,$newwidth,$newheight,$width,$height);
/* Uncomment in case you want it also outputted
header('Content-Type: image/jpeg');
imagejpeg($new_image);
*/
switch($ext){
case 'jpeg':
case 'jpg':
imagejpeg($thumb, $dir.$in_filename);
break;
case 'gif':
imagegif($thumb, $dir.$in_filename);
break;
case 'png':
imagepng($thumb, $dir.$in_filename);
break;
}?>