php 如何将GIF动态图像缩放成指定大小后依旧保持动态？
<?php
// The file
$filename = 'test.jpg';
$percent = 0.5;
// Content type
header('Content-type: image/jpeg');
// Get new dimensions
list($width, $height) = getimagesize($filename);
$new_width = $width * $percent;
$new_height = $height * $percent;
// Resample
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
// Output
imagejpeg($image_p, null, 100);
?>
上传图片后，可以对原图片利有上边的代码处理。缩放
GD库操作即可
此js代码来自百度logo的处理，还是很好用的，需要注意的地方就是proMaxHeight，proMaxWidth 参数的动态获取，你可以直接用php赋值，或者用smarty phplib之类的模板，这个不难
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-CN" lang="zh-CN">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>test</title>
<script language=Javascript>
var proMaxHeight = 50;
var proMaxWidth = 50;
function proDownImage(ImgD){
var image=new Image();
image.src=ImgD.src;
if(image.width>0 && image.height>0){
var rate = (proMaxWidth/image.width < proMaxHeight/image.height)?proMaxWidth/image.width:proMaxHeight/image.height;
if(rate <= 1){
ImgD.width = image.width*rate;
ImgD.height =image.height*rate;
}
else {
ImgD.width = image.width;
ImgD.height =image.height;
}
}
}
//-->
</script>
</head>
<body bgcolor="#ffffff" topmargin="0" leftmargin="0" scroll="no">
<img src="./pp.gif" onload=proDownImage(this); />
</body>
</html>
php的GD库是不支持GIF格式的动态图片重写的，就直接限制图片<img />标签的大小算了
美图秀秀
