2-9图像处理之缩略图

 1 <?php
 2 /**
 3  * 缩略图
 4  *
 5  */
 6 
 7 
 8 //创建原图
 9 $srcIm = imagecreatefromjpeg('../image/a.jpg');
10 
11 $srcW = imagesx($srcIm);
12 $srcH = imagesy($srcIm);
13 
14 $percent = 0.5;
15 
16 $desW = $srcW * $percent;
17 $desH = $srcH * $percent;
18 
19 //创建新图
20 $desIm = imagecreatetruecolor($desW, $desH);
21 
22 //拷贝图像并调整大小
23 //imagecopyresized();
24 
25 //重采样拷贝图像并调整大小
26 imagecopyresampled($desIm, $srcIm, 0, 0, 0, 0, $desW, $desH, $srcW, $srcH);
27 
28 //生成图采用jpeg
29 imagejpeg($desIm, "../image/a_{$desW}_{$desH}.jpg", 75);
30 //imagepng($desIm,"../image/a_{$desW}_{$desH}.png");