当调整一些png图像的大小时,它们看起来会拉长,看上去像垂直隔行扫描。我不确定问题出在哪里,但是我开始思考它,因为图像从灰度开始,需要有不同的颜色配置文件。调整灰度PNG大小时出现白线
任何帮助或建议,将不胜感激。
function createImageSize($sourcefile, $setNewName, $maxwidth, $maxheight, $quality){
$fileInfoArray = @getimagesize($sourcefile);
$imagetype = $fileInfoArray['mime'];
list($width, $height, $attr) = getimagesize($sourcefile);
switch($imagetype){
case 'image/jpeg':
$img = imagecreatefromjpeg($sourcefile);
break;
case 'image/gif':
$img = imagecreatefromgif($sourcefile);
break;
case 'image/png':
$img = imagecreatefrompng($sourcefile);
break;
case 'image/x-png':
$img = imagecreatefrompng($sourcefile);
break;
}
if ($width > $maxwidth || $height > $maxheight){
if ($width > $height){
$newwidth = $maxwidth;
$ratio = $maxwidth/$width;
$newheight = floor($height * $ratio);
if ($newheight > $maxheight){
$newheight = $maxheight;
$ratio = $maxheight/$height;
$newwidth = floor($width * $ratio);
}
}else{
$newheight = $maxheight;
$ratio = $maxheight/$height;
$newwidth = floor($width * $ratio);
if ($newwidth > $maxwidth){
$newwidth = $maxwidth;
$ratio = $maxwidth/$width;
$newheight = floor($height * $ratio);
}
}
}else{
$newwidth = $width;
$newheight = $height;
}
$tmpimg = imagecreatetruecolor($newwidth, $newheight);
if($imagetype == 'image/png'||$imagetype == 'image/x-png'){
imagealphablending($tmpimg, false);
imagesavealpha($tmpimg, true);
if($imagetype == 'image/gif'){
$transparent = imagecolorallocatealpha($tmpimg, 0, 0, 0, 127);
imagecolortransparent($tmpimg, $transparent);
}
imagefilledrectangle($tmpimg, 0, 0, $newwidth, $newheight, $transparent);
}
imagecopyresampled($tmpimg, $img, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
switch($imagetype){
case 'image/jpeg':
imagejpeg($tmpimg, $setNewName, $quality);
break;
case 'image/gif':
imagegif($tmpimg, $setNewName);
break;
case 'image/png':
imagepng($tmpimg, $setNewName, 3);
break;
case 'image/x-png':
imagepng($tmpimg, $setNewName, 3);
break;
}
imagedestroy($tmpimg);
imagedestroy($img);
}
您是否正在运行检查以查看图像是灰度还是PNG8?看起来这可能是一个很好的方法来解决这个问题,所以如果不需要的话,并不是每个PNG8都会被转换。 – stwhite 2011-01-27 08:28:17