我正在创建各种格式的(jpg, png)
的myImage
缩略图。这是我的代码
<?php
error_reporting(E_ALL);
//$file = 'H:/xampp/htdocs/myfolder/new.jpg';
$file = 'H:/xampp/htdocs/myfolder/phool.png';
$pathToSave = 'H:/xampp/myfolder/New/';
$sourceWidth =60;
$sourceHeight = 60;
$what = getimagesize($file);
$file_name = basename($file);
//print "MIME ".$what['mime'];
switch(strtolower($what['mime']))
{
case 'image/png':
$img = imagecreatefrompng($file);
$img = imagecreatefromstring($img);
$new = imagecreatetruecolor($what[0],$what[1]);
imagecopy($new,$img,0,0,0,0,$what[0],$what[1]);
header('Content-Type: image/png');
imagepng($new,$pathToSave.$file_name);
imagedestroy($new);
break;
case 'image/jpeg':
$img = imagecreatefromjpeg($file);
$new = imagecreatetruecolor($what[0],$what[1]);
imagecopy($new,$img,0,0,0,0,$what[0],$what[1]);
header('Content-Type: image/jpeg');
imagejpeg($new,$pathToSave.$file_name);
imagedestroy($new);
break;
case 'image/gif':
$img = imagecreatefromgif($file);
break;
default: die();
}
但是,它不适用于PNG图像。它会在我的目的地$pathToSave = 'H:/xampp/htdocs/myfolder/New/'
中保存一张空白图像。
如果我移除$img = imagecreatefromstring($img);
,则imagepng
按原样保存图像,但不像imagejpg
那样压缩图像。
$img = imagecreatefrompng($file); //Creates an image from a png file
$img = imagecreatefromstring($img); //Creates an image from a string
基本上,您使用imagecreatefrompng($file)在内存中创建一个图像,但随后您使用imagecreatefromstring($img)覆盖相同的变量,该变量不接受GDImage变量作为参数,因此它返回一个空白图像(或null?)。
只需从字符串中删除imagecreate($img);它会起作用的。
$newImage = imagecreatetruecolor($newwidth, $newheight);
$source = imagecreatefrompng($fileurl);
imagecopyresized($newImage, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
imagepng($newImage,$fileurl);
imagedestroy($newImage);
imagedestroy($source);
试试这个,它对我有效
$img = imagecreatefrompng( $file);
$new = imagecreatetruecolor( $what[0],$what[1]);
imagecopyresampled( $new, $img, 0,0,0,0,$what[0],$what[1] );
imagecopy重采样的参考