PHP png黑色背景已上傳

Question

從服務器加載圖像時出現問題。 PNG格式的圖像背景變黑。

對不起，英文 在此先感謝。

<?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");?> 

你能告訴我這裏有什麼問題嗎？我應該做些什麼？

Answer 1

這是可怕的代碼！代碼 $this->image = imagecreatefrompng($filename); 是正確的，應該正確加載png。檢查圖像是否應該在哪裏。 PNG是否包含透明度？如果是這樣，你需要執行一些技巧來保持透明度。

見：Can PNG image transparency be preserved when using PHP's GDlib imagecopyresampled?