2-9图像处理之缩略图

<?php
/**
 * 缩略图
 *
 */


//创建原图
$srcIm = imagecreatefromjpeg('../image/a.jpg');

$srcW = imagesx($srcIm);
$srcH = imagesy($srcIm);

$percent = 0.5;

$desW = $srcW * $percent;
$desH = $srcH * $percent;

//创建新图
$desIm = imagecreatetruecolor($desW, $desH);

//拷贝图像并调整大小
//imagecopyresized();

//重采样拷贝图像并调整大小
imagecopyresampled($desIm, $srcIm, 0, 0, 0, 0, $desW, $desH, $srcW, $srcH);

//生成图采用jpeg
imagejpeg($desIm, "../image/a_{$desW}_{$desH}.jpg", 75);
//imagepng($desIm,"../image/a_{$desW}_{$desH}.png");