请问关于php生成缩略图的有关问题!
请教关于php生成缩略图的问题!!!
下面的代码可以生成图片缩略图,但是图片质量会降低,谁能帮助修改下,以控制生成的图片质量?
/*
* 功能:PHP图片水印 (水印支持图片或文字)
* 参数:
* $groundImage 背景图片,即需要加水印的图片,暂只支持GIF,JPG,PNG格式;
* $waterPos 水印位置,有10种状态,0为随机位置;
* 1为顶端居左,2为顶端居中,3为顶端居右;
* 4为中部居左,5为中部居中,6为中部居右;
* 7为底端居左,8为底端居中,9为底端居右;
* $waterImage 图片水印,即作为水印的图片,暂只支持GIF,JPG,PNG格式;
* $waterText 文字水印,即把文字作为为水印,支持ASCII码,不支持中文;
* $fontSize 文字大小,值为1、2、3、4或5,默认为5;
* $textColor 文字颜色,值为十六进制颜色值,默认为#CCCCCC(白灰色);
* $fontfile ttf字体文件,即用来设置文字水印的字体。使用windows的用户在系统盘的目录中
* 搜索*.ttf可以得到系统中安装的字体文件,将所要的文件拷到网站合适的目录中,
* 默认是当前目录下arial.ttf。
* $xOffset 水平偏移量,即在默认水印坐标值基础上加上这个值,默认为0,如果你想留给水印留
* 出水平方向上的边距,可以设置这个值,如:2 则表示在默认的基础上向右移2个单位,-2 表示向左移两单位
* $yOffset 垂直偏移量,即在默认水印坐标值基础上加上这个值,默认为0,如果你想留给水印留
* 出垂直方向上的边距,可以设置这个值,如:2 则表示在默认的基础上向下移2个单位,-2 表示向上移两单位
* 返回值:
* 0 水印成功
* 1 水印图片格式目前不支持
* 2 要水印的背景图片不存在
* 3 需要加水印的图片的长度或宽度比水印图片或文字区域还小,无法生成水印
* 4 字体文件不存在
* 5 水印文字颜色格式不正确
* 6 水印背景图片格式目前不支持
* 修改记录:
*
* 注意:Support GD 2.0,Support FreeType、GIF Read、GIF Create、JPG 、PNG
* $waterImage 和 $waterText 最好不要同时使用,选其中之一即可,优先使用 $waterImage。
* 当$waterImage有效时,参数$waterString、$stringFont、$stringColor均不生效。
* 加水印后的图片的文件名和 $groundImage 一样。
* 作者:高西林
* 日期:2007-4-28
* 说明:本程序根据longware的程序改写而成。
*/
//调用方法:
//$imageWaterMark = imageWaterMark("1.jpg", 9, "3.png", "", "", "", "", "-50", "-50");
function imageWaterMark($groundImage,$waterPos=0,$waterImage="",$waterText="",$fontSize=12,$textColor="#CCCCCC", $fontfile='./arial.ttf',$xOffset=0,$yOffset=0)
{
$isWaterImage = FALSE;
//读取水印文件
if(!empty($waterImage) && file_exists($waterImage)) {
$isWaterImage = TRUE;
$water_info = getimagesize($waterImage);
$water_w = $water_info[0];//取得水印图片的宽
$water_h = $water_info[1];//取得水印图片的高
switch($water_info[2]) { //取得水印图片的格式
case 1:$water_im = imagecreatefromgif($waterImage);break;
case 2:$water_im = imagecreatefromjpeg($waterImage);break;
case 3:$water_im = imagecreatefrompng($waterImage);break;
default:return 1;
}
}
//读取背景图片
if(!empty($groundImage) && file_exists($groundImage)) {
$ground_info = getimagesize($groundImage);

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