Creating a thumbnail from an uploaded image showing black background - php

Question

I'm getting image thumbnail but background is black.i could not understand why it is happening.Though i found this script in stackoverflow.
Is it problem in gd library.i'm using xampp
makeThumbnails($upload_dir.$new_nm,227,182,$upload_dir_thumb.$new_nm);
function makeThumbnails($src,$w,$h,$dir)
{
$arr_image_details = getimagesize($src);
$original_width = $arr_image_details[0];
$original_height = $arr_image_details[1];
if ($original_width > $original_height) {
$new_width = $w;
$new_height = intval($original_height * $new_width / $original_width);
} else {
$new_height = $h;
$new_width = intval($original_width * $new_height / $original_height);
}
$dest_x = intval(($w - $new_width) / 2);
$dest_y = intval(($h - $new_height) / 2);
if ($arr_image_details[2] == 1) {
$imgt = "ImageGIF";
$imgcreatefrom = "ImageCreateFromGIF";
}
if ($arr_image_details[2] == 2) {
$imgt = "ImageJPEG";
$imgcreatefrom = "ImageCreateFromJPEG";
}
if ($arr_image_details[2] == 3) {
$imgt = "ImagePNG";
$imgcreatefrom = "ImageCreateFromPNG";
}
if ($imgt) {
$old_image = $imgcreatefrom($src);
$new_image = imagecreatetruecolor($w, $h);
imagecopyresized($new_image, $old_image, $dest_x, $dest_y, 0, 0, $new_width, $new_height, $original_width, $original_height);
$imgt($new_image, $dir);
}

Answer 1

I think You are doing wrong with $old_image = $imgcreatefrom($src)
What will return `$imgcreatefrom($src)` check it.

Answer 2

function makethumb($raw,$tw,$th,$DestFolder)
{
$arr_image_details = getimagesize($raw);
$CurWidth = $arr_image_details[0];
$CurHeight = $arr_image_details[1];
//print_r($arr_image_details);exit;
switch(strtolower($arr_image_details['mime']))
{
case 'image/png':
$CreatedImage = imagecreatefrompng($raw);
break;
case 'image/gif':
$CreatedImage = imagecreatefromgif($raw);
break;
case 'image/jpeg':
case 'image/pjpeg':
$CreatedImage = imagecreatefromjpeg($raw);
break;
default:
$processImage = false; //image format is not supported!
}
if($tw >=$th )
{
$MaxSize=$tw;
}else{
$MaxSize=$th;
}
$ImageScale = min($MaxSize/$CurWidth, $MaxSize/$CurHeight);
$NewWidth = ceil($ImageScale*$CurWidth);
$NewHeight = ceil($ImageScale*$CurHeight);
if($CurWidth < $NewWidth || $CurHeight < $NewHeight)
{
$NewWidth = $CurWidth;
$NewHeight = $CurHeight;
}
$NewCanves = imagecreatetruecolor($NewWidth, $NewHeight);
if(imagecopyresampled($NewCanves, $CreatedImage,0, 0, 0, 0, $NewWidth, $NewHeight, $CurWidth, $CurHeight))
{
switch(strtolower($arr_image_details['mime']))
{
case 'image/png':
imagepng($NewCanves,$DestFolder);
break;
case 'image/gif':
imagegif($NewCanves,$DestFolder);
break;
case 'image/jpeg':
case 'image/pjpeg':
imagejpeg($NewCanves,$DestFolder,90);
break;
default:
return false;
}
if(is_resource($NewCanves)) {
imagedestroy($NewCanves);
}
return true;
}
}