Php png黑色背景上传

从服务器加载映像时出现问题。PNG格式的图像背景变为黑色

对不起，英语不好 提前谢谢

<?php

//Database Settings
include('../../../../includes/bdconfig.ini.php');

$t = time();

//Database Required Settings
include('../../../../includes/adminrequired.php');

//If Not Logged In Redirect to Login Page
if(!$session){header("Location: $siteurl/admin/login/");}

// Image Re-size and Thumbnail Features Go Here

$h1 = "SELECT * FROM dlistings ORDER BY listed DESC LIMIT 0, 1"; $k1 = mysql_query($h1); $c1 = mysql_fetch_array($k1);

$productid = "$c1[did]";

class SimpleImage {var $image; var $image_type;

function load($filename) {$image_info = getimagesize($filename); $this->image_type = $image_info[2];
if( $this->image_type == IMAGETYPE_JPEG ) {$this->image = imagecreatefromjpeg($filename);}
elseif( $this->image_type == IMAGETYPE_GIF ) {$this->image = imagecreatefromgif($filename);}
elseif( $this->image_type == IMAGETYPE_PNG ) {$this->image = imagecreatefrompng($filename);}}

function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null) {if( $image_type == IMAGETYPE_JPEG ) {imagejpeg($this->image,$filename,$compression);}
elseif( $image_type == IMAGETYPE_GIF ) {imagegif($this->image,$filename);}
elseif( $image_type == IMAGETYPE_PNG ) {imagepng($this->image,$filename);}   
if( $permissions != null) {chmod($filename,$permissions);}}

function output($image_type=IMAGETYPE_JPEG) {if( $image_type == IMAGETYPE_JPEG ) {imagejpeg($this->image);}
elseif( $image_type == IMAGETYPE_GIF ) {imagegif($this->image);}
elseif( $image_type == IMAGETYPE_PNG ) {imagepng($this->image);}}

function getWidth() {return imagesx($this->image);}
function getHeight() {return imagesy($this->image);}

function resizeToHeight($height) {$ratio = $height / $this->getHeight();
$width = $this->getWidth() * $ratio;
$this->resize($width,$height);}

function resizeToWidth($width) {$ratio = $width / $this->getWidth();
$height = $this->getheight() * $ratio;
$this->resize($width,$height);}

function scale($scale) {$width = $this->getWidth() * $scale/100;
$height = $this->getheight() * $scale/100; 
$this->resize($width,$height);}

function resize($width,$height) {$new_image = imagecreatetruecolor($width, $height)  ;  

imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());

$this->image = $new_image;}}





$image = new SimpleImage();

//Re-size and Create Thumbnail if Image 1 Exist
if($c1[img1]){

$img1name = "../../../../imgs/1/$c1[img1]";
$thumb1name = "../../../../thumbs/imgs/$c1[img1]";

$img1_dimensions = getimagesize($img1name);
$awidth = $img1_dimensions[0];
$aheight = $img1_dimensions[1];

$arpercent = '100';
if($awidth > 350){$arpercent = '95';}
if($awidth > 500){$arpercent = '90';}
if($awidth > 700){$arpercent = '50';}
if($awidth > 900){$arpercent = '40';}
if($awidth > 1100){$arpercent = '30';}
if($awidth > 1400){$arpercent = '25';}
if($awidth > 1600){$arpercent = '20';}
if($awidth > 1800){$arpercent = '15';}

$anewwidth = round((($arpercent/100)*$awidth));
$anewheight = round((($arpercent/100)*$aheight));

if($anewwidth > 450){$anewwidth = '400'; $anewheight = '400';}

$image->load($img1name);
$image->resize($anewwidth,$anewheight);
$image->save($img1name);

$image->load($img1name);
$image->resize(100,100);
$image->save($thumb1name);

}

//Re-size if Image 2 Exist
if($c1[img2]){

$img2name = "../../../../imgs/2/$c1[img2]";

$img2_dimensions = getimagesize($img2name);
$bwidth = $img2_dimensions[0];
$bheight = $img2_dimensions[1];

$brpercent = '100';
if($bwidth > 350){$brpercent = '90';}
if($bwidth > 500){$brpercent = '90';}
if($bwidth > 700){$brpercent = '50';}
if($bwidth > 900){$brpercent = '40';}
if($bwidth > 1100){$brpercent = '30';}
if($bwidth > 1400){$brpercent = '25';}
if($bwidth > 1600){$brpercent = '20';}
if($bwidth > 1800){$brpercent = '15';}

$bnewwidth = round((($brpercent/100)*$bwidth));
$bnewheight = round((($brpercent/100)*$bheight));

if($bnewwidth > 450){$bnewwidth = '400'; $bnewheight = '400';}

$image->load($img2name);
$image->resize($bnewwidth,$bnewheight);
$image->save($img2name);

}

//Re-size if Image 3 Exist
if($c1[img3]){

$img3name = "../../../../imgs/3/$c1[img3]";

$img3_dimensions = getimagesize($img3name);
$cwidth = $img3_dimensions[0];
$cheight = $img3_dimensions[1];

$crpercent = '100';
if($cwidth > 350){$crpercent = '90';}
if($cwidth > 500){$crpercent = '90';}
if($cwidth > 700){$crpercent = '50';}
if($cwidth > 900){$crpercent = '40';}
if($cwidth > 1100){$crpercent = '30';}
if($cwidth > 1400){$crpercent = '25';}
if($cwidth > 1600){$crpercent = '20';}
if($cwidth > 1800){$crpercent = '15';}

$cnewwidth = round((($crpercent/100)*$cwidth));
$cnewheight = round((($crpercent/100)*$cheight));

if($cnewwidth > 450){$cnewwidth = '400'; $cnewheight = '400';}

$image->load($img3name);
$image->resize($cnewwidth,$cnewheight);
$image->save($img3name);

}

//Re-size if Image 4 Exist
if($c1[img4]){

$img4name = "../../../../imgs/4/$c1[img4]";

$img4_dimensions = getimagesize($img4name);
$dwidth = $img4_dimensions[0];
$dheight = $img4_dimensions[1];

$drpercent = '100';
if($dwidth > 350){$drpercent = '90';}
if($dwidth > 500){$drpercent = '90';}
if($dwidth > 700){$drpercent = '50';}
if($dwidth > 900){$drpercent = '40';}
if($dwidth > 1100){$drpercent = '30';}
if($dwidth > 1400){$drpercent = '25';}
if($dwidth > 1600){$drpercent = '20';}
if($dwidth > 1800){$drpercent = '15';}

$dnewwidth = round((($drpercent/100)*$dwidth));
$dnewheight = round((($drpercent/100)*$dheight));

if($dnewwidth > 450){$dnewwidth = '400'; $dnewheight = '400';}

$image->load($img4name);
$image->resize($dnewwidth,$dnewheight);
$image->save($img4name);

}

header("Location: $siteurl/admin/manage/listings/?added=listing&productid=$productid");?>

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你能告诉我这里怎么了吗？我该怎么办？

这是可怕的代码！还是密码

$this->image=imagecreatefrompng（$filename）；

正确，应正确加载png。检查图像是否位于它应该位于的位置。png是否包含透明度？如果是这样，您需要执行一些技巧来保持透明度

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请参阅：

可能重复是的，所有图片的透明度标准当然不能以任何方式解决此问题