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POuploading png images with transparent background using php and keeping the background transparent
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  1. POuploading png images with transparent background using php and keeping the background transparent
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    copied!<p>I have a php page which takes a user image and uploads it to my webserver. </p> <p>I have just noticed that if I have a png with a transparent background, and upload it, the background is changed to white.</p> <p>For example I create a new image in photoshop with a transparent background and then add a coloured circle to the page. I save the image as a png and uplod to the server via ftp then the image is shown as a circle on the webpage as the background is transparent.</p> <p>If I upload the image using php with a file input box the image is changed to white.</p> <p>I have tried to use imagealphablending,imagecolorallocatealpha,imagefill and imagesavealpha to retain the transparent background but it just changes the bg to black.</p> <p>any clues?</p> <p>heres my php code</p> <pre><code> &lt;?php $path = "../userfiles/orig/"; $userpath="../".$_REQUEST['userpath']."/"; function getExtension($str) { $i = strrpos($str,"."); if (!$i) { return ""; } $l = strlen($str) - $i; $ext = substr($str,$i+1,$l); return $ext; } $valid_formats = array("jpg", "png", "gif", "bmp","jpeg","PNG","JPG","JPEG","GIF","BMP"); if(isset($_POST) and $_SERVER['REQUEST_METHOD'] == "POST"){ $name = $_FILES['photoimg']['name']; $size = $_FILES['photoimg']['size']; if(strlen($name)){ $ext = getExtension($name); if(in_array($ext,$valid_formats)){ if($size&lt;(2048*2048)){ $time1=time(); $actual_image_name =$time1."_".str_replace(" ", "_", $name); $tmp = $_FILES['photoimg']['tmp_name']; if(move_uploaded_file($tmp, $path.$actual_image_name)){ $image=$actual_image_name; /*--------resize image-----------*/ $size = 320; // the imageheight $filedir = '../userfiles/orig/'; // the directory for the original image $thumbdir = $userpath; // the directory for the resized image $prefix = $time1.'_'; // the prefix to be added to the original name $maxfile = '20000000'; $mode = '0666'; $userfile_name =str_replace(" ", "", $_FILES['photoimg']['name']); $userfile_tmp = str_replace(" ", "", $_FILES['photoimg']['tmp_name']); $userfile_size =$_FILES['photoimg']['size']; $userfile_type = $_FILES['photoimg']['type']; if (isset($_FILES['photoimg']['name'])){ $prod_img = $filedir.$actual_image_name; $prod_img_thumb = $thumbdir.$prefix.$userfile_name; move_uploaded_file($userfile_tmp, $prod_img); chmod ($prod_img, octdec($mode)); $sizes = getimagesize($prod_img); $aspect_ratio = $sizes[1]/$sizes[0]; if ($sizes[1] &lt;= $size){ $new_width = $sizes[0]; $new_height = $sizes[1]; }else{ $new_height = $size; $new_width = abs($new_height/$aspect_ratio); } $destimg=ImageCreateTrueColor($new_width,$new_height) or die('Problem In Creating image'); switch($ext){ case "jpg": case "jpeg": case "JPG": case "JPEG": $srcimg=ImageCreateFromJPEG($prod_img)or die('Problem In opening Source Image'); break; case "PNG": case "png": $srcimg = imageCreateFromPng($prod_img)or die('Problem In opening Source Image'); imagealphablending($destimg, false); $colorTransparent = imagecolorallocatealpha($destimg, 0, 0, 0x7fff0000); imagefill($destimg, 0, 0, $colorTransparent); imagesavealpha($destimg, true); break; case "BMP": case "bmp": $srcimg = imageCreateFromBmp($prod_img)or die('Problem In opening Source Image'); break; case "GIF": case "gif": $srcimg = imageCreateFromGif($prod_img)or die('Problem In opening Source Image'); break; default: $srcimg=ImageCreateFromJPEG($prod_img)or die('Problem In opening Source Image'); } if(function_exists('imagecopyresampled')){ imagecopyresampled($destimg,$srcimg,0,0,0,0,$new_width,$new_height,imagesX($srcimg),imagesY($srcimg)) or die('Problem In resizing'); }else{ Imagecopyresized($destimg,$srcimg,0,0,0,0,$new_width,$new_height,imagesX($srcimg),imagesY($srcimg)) or die('Problem In resizing'); } ImageJPEG($destimg,$prod_img_thumb,90) or die('Problem In saving'); } unlink($prod_img); echo "&lt;img src='".$prod_img_thumb."'&gt;"; }else{ echo "Fail upload folder with read access."; } }else{ echo "Image file size max 3 MB"; } }else{ echo "Invalid file format.."; } }else{ echo "Please select image..!"; } exit; } ?&gt; </code></pre>
 

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