php缩放图片,为图片添加水印
分类:多线程

推荐一个简单实用的缩放图片工具 SimpleImage,参考

有两种改变图像大小的方法. (1):ImageCopyResized() 函数在所有GD版本中有效,但其缩放图像的算法比较粗糙.
(2):ImageCopyResampled(),其像素插值算法得到的图像边缘比较平滑.质量较好(但该函数的速度比 ImageCopyResized() 慢).
两个函数的参数是一样的.如下: ImageCopyResampled(dest,src,dx,dy,sx,sy,dw,dh,sw,sh);
ImageCopyResized(dest,src,dx,dy,sx,sy,dw,dh,sw,sh);
它们两个都是从原图像(source)中抓取特定位置(sx,sy)复制图像qu区域到目标t 图像(destination)的特定位置(dx,dy)。另外dw,dh指定复制的图像区域在目标图像上的大小,sw,sh指定从原图像复制的图像区域 的大小。如果有ps经验的话,就相当于在原图像选择一块区域,剪切移动到目的图像上,同时有拉伸或缩小的操作。
例一: (本例子是将图片按原大小的4/1的大小显示)
复制代码 代码如下:
// 指定文件路径和缩放比例
$filename = 'test.jpg';
$percent = 0.5;
// 指定头文件Content typezhi值
header('Content-type: image/jpeg');
// 获取图片的宽高
list($width, $height) = getimagesize($filename);
$newwidth = $width * $percent;
$newheight = $height * $percent;
// 创建一个图片。接收参数分别为宽高,返回生成的资源句柄
$thumb = imagecreatetruecolor($newwidth, $newheight);
//获取源文件资源句柄。接收参数为图片路径,返回句柄
$source = imagecreatefromjpeg($filename);
// 将源文件剪切全部域并缩小放到目标图片上。前两个为资源句柄
imagecopyresampled($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
// 输出给浏览器
imagejpeg($thumb);
?>

使用方法示例:
设定宽度,等比例缩放

使用方法:

推荐一个简单实用的缩放图片工具 SimpleImage,参考http://www.white-hat-web-design.co.uk/blog/resizing-images-with-php/ 使用方法: 复制代码 代码如下:
   include('SimpleImage.php');
   $image = new SimpleImage();
   $image->load('picture.jpg');
   $image->resize(250,400);
   $image->save('picture2.jpg');?>
设定宽度,等比例缩放
   include('SimpleImage.php');
   $image = new SimpleImage();
   $image->load('picture.jpg');
   $image->resizeToWidth(250);
   $image->save('picture2.jpg');?>
设定高度,等比例缩放
   include('SimpleImage.php');
   $image = new SimpleImage();
   $image->load('picture.jpg');
   $image->resizeToHeight(500);
   $image->save('picture2.jpg');
   $image->resizeToHeight(200);
   $image->save('picture3.jpg');?>
按比例,缩放至50%
   include('SimpleImage.php');
   $image = new SimpleImage();
   $image->load('picture.jpg');
   $image->scale(50);
   $image->save('picture2.jpg');?>
缩放后直接输出到屏幕
   header('Content-Type: image/jpeg');
   include('SimpleImage.php');
   $image = new SimpleImage();
   $image->load('picture.jpg');
   $image->resizeToWidth(150);
   $image->output();?>

复制代码 代码如下:

设定宽高,不等比例缩放
复制代码 代码如下:
include('SimpleImage.php');
$image = new SimpleImage();
$image->load('picture.jpg');
$image->resize(250,400);
$image->save('picture2.jpg');?>

SimpleImage.php 源码请轻点文章开头链接,到那下载

为图片加上水印
复制代码 代码如下:
  $source=imagecreatefromjpeg('E:/image/guide_pic.jpg');
  $thumb=imagecreatefromjpeg('E:/image/l.JPG');
//取得图片的宽度,高度,类型
  list($width,$height,$mine)=getimagesize('E:/image/guide_pic.jpg');
  imagecopymerge ($source,$thumb,$width-124,$height-150,0,0,88,73,70);
//生成图片
  imagejpeg($source,'E:/image/logo.jpg');
?>

<?php
   include('SimpleImage.php');
   $image = new SimpleImage();
   $image->load('picture.jpg');
   $image->resizeToWidth(250);
   $image->save('picture2.jpg');?>

设定宽度,等比例缩放

设定高度,等比例缩放

include('SimpleImage.php');
$image = new SimpleImage();
$image->load('picture.jpg');
$image->resizeToWidth(250);
$image->save('picture2.jpg');?>

复制代码 代码如下:

设定高度,等比例缩放

<?php
   include('SimpleImage.php');
   $image = new SimpleImage();
   $image->load('picture.jpg');
   $image->resizeToHeight(500);
   $image->save('picture2.jpg');
   $image->resizeToHeight(200);
   $image->save('picture3.jpg');?>

include('SimpleImage.php');
$image = new SimpleImage();
$image->load('picture.jpg');
$image->resizeToHeight(500);
$image->save('picture2.jpg');
$image->resizeToHeight(200);
$image->save('picture3.jpg');?>

按比例,缩放至50%

按比例,缩放至50%

复制代码 代码如下:

include('SimpleImage.php');
$image = new SimpleImage();
$image->load('picture.jpg');
$image->scale(50);
$image->save('picture2.jpg');?>

<?php
   include('SimpleImage.php');
   $image = new SimpleImage();
   $image->load('picture.jpg');
   $image->scale(50);
   $image->save('picture2.jpg');?>

缩放后直接输出到屏幕

缩放后直接输出到屏幕

header('Content-Type: image/jpeg');
include('SimpleImage.php');
$image = new SimpleImage();
$image->load('picture.jpg');
$image->resizeToWidth(150);
$image->output();?>

复制代码 代码如下:

SimpleImage.php 源码请轻点文章开头链接,到那下载

<?php
   header('Content-Type: image/jpeg');
   include('SimpleImage.php');
   $image = new SimpleImage();
   $image->load('picture.jpg');
   $image->resizeToWidth(150);
   $image->output();?>

使用例子:

复制代码 代码如下:

<?php
include("SimpleImage.php");//图片处理类在下面

$url="";
$picfile = down($url);//下载图片(下载图片的路径可以处理完成后清空,这里未进行处理)
$res = new SimpleImage();//图片处理实例
$res = $res->load($picfile);
$tmpfile = tempfile().'.jpg';//创建一个路径文件用来保存图片
$width = '30';//设定图片的宽度
$res->resizeToWidth($width);
$res->save($tmpfile);//把处理后的图片保存(无.jpg后缀)
//这里总共产生了3个文件,一个是下载的图片文件,一个是临时文件,最后一个是处理的图片文件。需要优化清理掉前两个文件。

 

function down($url)
{
        $http = array();
        $header = "";
        if ($header) {
            $http['header'] = $header;
        }

        $http['timeout'] = 50;

        $ctx = stream_context_create(array(
            'http' => $http,
        ));
        $content = @file_get_contents($url, 0, $ctx);
        sleep(1);

        if (!$content) {
            return false;
        }

        $tmpfile = tempfile();

        file_put_contents($tmpfile, $content);

        return $tmpfile;
}

function tempfile()
{
        $path = dirname(__FILE__);
        $path .= '/spider/' . date('Ymd') . '/'.date('His').'-' . (int)(time() / 300);

        if (!file_exists($path)) {
            mkdir($path, 0777, true);
        }

        do {
            $file = $path . '/' . dechex(mt_rand());
        }
        while (file_exists($file));

        touch($file);

        return $file;
}

图片处理类源码(官网地址:

复制代码 代码如下:

<?php

/*
* File: SimpleImage.php
* Author: Simon Jarvis
* Copyright: 2006 Simon Jarvis
* Date: 08/11/06
* Link:
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details:
*
*
*/

class SimpleImage {

    var $image;
    var $image_type;

    function load($filename) {

        $image_info = getimagesize($filename);
        $this->image_type = $image_info[2];
        if( $this->image_type == IMAGETYPE_JPEG ) {

            $this->image = @imagecreatefromjpeg($filename);
        } elseif( $this->image_type == IMAGETYPE_GIF ) {

            $this->image = @imagecreatefromgif($filename);
        } elseif( $this->image_type == IMAGETYPE_PNG ) {

            $this->image = @imagecreatefrompng($filename);
        }

        if (!$this->image) {
            return false;
        }

        return $this;
    }

    function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null) {

        if( $image_type == IMAGETYPE_JPEG ) {
            imagejpeg($this->image,$filename,$compression);
        } elseif( $image_type == IMAGETYPE_GIF ) {

            imagegif($this->image,$filename);
        } elseif( $image_type == IMAGETYPE_PNG ) {

            imagepng($this->image,$filename);
        }
        if( $permissions != null) {

            chmod($filename,$permissions);
        }
    }
    function output($image_type=IMAGETYPE_JPEG) {

        if( $image_type == IMAGETYPE_JPEG ) {
            imagejpeg($this->image);
        } elseif( $image_type == IMAGETYPE_GIF ) {

            imagegif($this->image);
        } elseif( $image_type == IMAGETYPE_PNG ) {

            imagepng($this->image);
        }
    }
    function getWidth() {

        return imagesx($this->image);
    }
    function getHeight() {

        return imagesy($this->image);
    }
    function resizeToHeight($height) {

        $ratio = $height / $this->getHeight();
        $width = $this->getWidth() * $ratio;
        $this->resize($width,$height);
    }

    function resizeToWidth($width) {
        if ($this->getWidth() < $width) {
            $width = $this->getWidth();
        }
        $ratio = $width / $this->getWidth();
        $height = $this->getheight() * $ratio;
        $this->resize($width,$height);
    }

    function scale($scale) {
        $width = $this->getWidth() * $scale/100;
        $height = $this->getheight() * $scale/100;
        $this->resize($width,$height);
    }

    function resize($width,$height) {
        $new_image = imagecreatetruecolor($width, $height);
        imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
        $this->image = $new_image;
    }

 
    function resize2($width,$height) {
        $new_image = imagecreatetruecolor($width, $height);
        if( $this->image_type == IMAGETYPE_GIF || $this->image_type == IMAGETYPE_PNG ) {
            $current_transparent = imagecolortransparent($this->image);
            if($current_transparent != -1) {
                $transparent_color = imagecolorsforindex($this->image, $current_transparent);
                $current_transparent = imagecolorallocate($new_image, $transparent_color['red'], $transparent_color['green'], $transparent_color['blue']);
                imagefill($new_image, 0, 0, $current_transparent);
                imagecolortransparent($new_image, $current_transparent);
            } elseif( $this->image_type == IMAGETYPE_PNG) {
                imagealphablending($new_image, false);
                $color = imagecolorallocatealpha($new_image, 0, 0, 0, 127);
                imagefill($new_image, 0, 0, $color);
                imagesavealpha($new_image, true);
            }
        }
        imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
        $this->image = $new_image;  
    }

}

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