用ImageMagick生成缩略图和处理图片，加水印等都不错，效率快质量高。
关于ImageMagick的一些介绍和安装，请查看ImageMagick安装及使用说明（windows版）
现在大街小巷到处是二维码，在二维码如此猖狂的时代，不自己生成几个二维码总觉得很别扭。。。
用PHP QRcode生成二维码是很简单的一件事，可以到http://sourceforge.net/p/phpqrcode/wiki/Home/查看demo以及下载安装。
原理很简单：用QRcode生成二维码、获取二维码图片并添加水印（水印图分为2张，1张背景圆角图+1张logo）
PHP QRcode生成二维码大致如下：
<?php
require '../phpqrcode.php';
// 二维码数据
$data = 'http://www.caijierui.com/';
// 纠错级别：L、M、Q、H
$level = 'H';
// 点的大小：1到10,用于手机端4就可以了
$pointsize = 4;
$path = "images/";
//生成的文件名
$fileName = $path.$pointsize.'.png';
//生成图片
QRcode::png($data, $fileName, $level, $pointsize);//如果不生成图片，把$fileName 改成 false即可
//echo "<img src='".$filename."'/>";
?>
要在二维码中间加LOGO，必须是先生成二维码图片，然后将二维码图片用imagemagick进行加水印处理。
上一步，咱们获取到图片路径为：$filename，用imagemagick配合处理的代码如下：
require '../imagick_class.php';
$image = new imagick_class();
$image->open($filename);
$image->resize_to(464,464,'scale_fill',array(255,255,255,0));//按比例压缩成464*464的图片，如超出范围则留白。
$image->get_img('./Uploads/yuanjiao.png', 184, 184);//添加水印，X坐标和Y坐标均为184
$image->get_img('./Uploads/logo.jpg', 184, 184,true);//后面的true表明需要剪裁
$image->save_to('./Uploads/dailogodeerweima.jpg');//保存图片
上面提到的圆角图片可以从这里下载：
（右键另存为图片）
imagick_class里面的内容如下：
<?
/*此类由一个叫Lou Barnes的人编写的，从网上下载的，觉得还能用，我在原有基础上，添加一个函数来针对二维码生成。*/
class imagick_class
{
private $image = null;
private $type = null;
// 构造函数
public function __construct(){}
// 析构函数
public function __destruct()
{
if($this->image!==null) $this->image->destroy();
}
// 载入图像
public function open($path)
{
$this->image = new Imagick( $path );
if($this->image)
{
$this->type = strtolower($this->image->getImageFormat());
}
return $this->image;
}
public function crop($x=0, $y=0, $width=null, $height=null)
{
if($width==null) $width = $this->image->getImageWidth()-$x;
if($height==null) $height = $this->image->getImageHeight()-$y;
if($width<=0 || $height<=0) return;
if($this->type=='gif')
{
$image = $this->image;
$canvas = new Imagick();
$images = $image->coalesceImages();
foreach($images as $frame){
$img = new Imagick();
$img->readImageBlob($frame);
$img->cropImage($width, $height, $x, $y);
$canvas->addImage( $img );
$canvas->setImageDelay( $img->getImageDelay() );
$canvas->setImagePage($width, $height, 0, 0);
}
$image->destroy();
$this->image = $canvas;
}
else
{
$this->image->cropImage($width, $height, $x, $y);
}
}
/*
* 更改图像大小
$fit: 适应大小方式
'force': 把图片强制变形成 $width X $height 大小
'scale': 按比例在安全框 $width X $height 内缩放图片, 输出缩放后图像大小 不完全等于 $width X $height
'scale_fill': 按比例在安全框 $width X $height 内缩放图片，安全框内没有像素的地方填充色, 使用此参数时可设置背景填充色 $bg_color = array(255,255,255)(红,绿,蓝, 透明度) 透明度(0不透明-127完全透明))
其它: 智能模能 缩放图像并载取图像的中间部分 $width X $height 像素大小
$fit = 'force','scale','scale_fill' 时： 输出完整图像
$fit = 图像方位值 时, 输出指定位置部分图像
字母与图像的对应关系如下:
north_west north north_east
west center east
south_west south south_east
*/
public function resize_to($width = 100, $height = 100, $fit = 'center', $fill_color = array(255,255,255,0) )
{
switch($fit)
{
case 'force':
if($this->type=='gif')
{
$image = $this->image;
$canvas = new Imagick();
$images = $image->coalesceImages();
foreach($images as $frame){
$img = new Imagick();
$img->readImageBlob($frame);
$img->thumbnailImage( $width, $height, false );
$canvas->addImage( $img );
$canvas->setImageDelay( $img->getImageDelay() );
}
$image->destroy();
$this->image = $canvas;
}
else
{
$this->image->thumbnailImage( $width, $height, false );
}
break;
case 'scale':
if($this->type=='gif')
{
$image = $this->image;
$images = $image->coalesceImages();
$canvas = new Imagick();
foreach($images as $frame){
$img = new Imagick();
$img->readImageBlob($frame);
$img->thumbnailImage( $width, $height, true );
$canvas->addImage( $img );
$canvas->setImageDelay( $img->getImageDelay() );
}
$image->destroy();
$this->image = $canvas;
}
else
{
$this->image->thumbnailImage( $width, $height, true );
}
break;
case 'scale_fill':
$size = $this->image->getImagePage();
$src_width = $size['width'];
$src_height = $size['height'];
$x = 0;
$y = 0;
$dst_width = $width;
$dst_height = $height;
if($src_width*$height > $src_height*$width)
{
$dst_height = intval($width*$src_height/$src_width);
$y = intval( ($height-$dst_height)/2 );
}
else
{
$dst_width = intval($height*$src_width/$src_height);
$x = intval( ($width-$dst_width)/2 );
}
$image = $this->image;
$canvas = new Imagick();
$color = 'rgba('.$fill_color[0].','.$fill_color[1].','.$fill_color[2].','.$fill_color[3].')';
if($this->type=='gif')
{
$images = $image->coalesceImages();
foreach($images as $frame)
{
$frame->thumbnailImage( $width, $height, true );
$draw = new ImagickDraw();
$draw->composite($frame->getImageCompose(), $x, $y, $dst_width, $dst_height, $frame);
$img = new Imagick();
$img->newImage($width, $height, $color, 'gif');
$img->drawImage($draw);
$canvas->addImage( $img );
$canvas->setImageDelay( $img->getImageDelay() );
$canvas->setImagePage($width, $height, 0, 0);
}
}
else
{
$image->thumbnailImage( $width, $height, true );
$draw = new ImagickDraw();
$draw->composite($image->getImageCompose(), $x, $y, $dst_width, $dst_height, $image);
$canvas->newImage($width, $height, $color, $this->get_type() );
$canvas->drawImage($draw);
$canvas->setImagePage($width, $height, 0, 0);
}
$image->destroy();
$this->image = $canvas;
break;
default:
$size = $this->image->getImagePage();
$src_width = $size['width'];
$src_height = $size['height'];
$crop_x = 0;
$crop_y = 0;
$crop_w = $src_width;
$crop_h = $src_height;
if($src_width*$height > $src_height*$width)
{
$crop_w = intval($src_height*$width/$height);
}
else
{
$crop_h = intval($src_width*$height/$width);
}
switch($fit)
{
case 'north_west':
$crop_x = 0;
$crop_y = 0;
break;
case 'north':
$crop_x = intval( ($src_width-$crop_w)/2 );
$crop_y = 0;
break;
case 'north_east':
$crop_x = $src_width-$crop_w;
$crop_y = 0;
break;
case 'west':
$crop_x = 0;
$crop_y = intval( ($src_height-$crop_h)/2 );
break;
case 'center':
$crop_x = intval( ($src_width-$crop_w)/2 );
$crop_y = intval( ($src_height-$crop_h)/2 );
break;
case 'east':
$crop_x = $src_width-$crop_w;
$crop_y = intval( ($src_height-$crop_h)/2 );
break;
case 'south_west':
$crop_x = 0;
$crop_y = $src_height-$crop_h;
break;
case 'south':
$crop_x = intval( ($src_width-$crop_w)/2 );
$crop_y = $src_height-$crop_h;
break;
case 'south_east':
$crop_x = $src_width-$crop_w;
$crop_y = $src_height-$crop_h;
break;
default:
$crop_x = intval( ($src_width-$crop_w)/2 );
$crop_y = intval( ($src_height-$crop_h)/2 );
}
$image = $this->image;
$canvas = new Imagick();
if($this->type=='gif')
{
$images = $image->coalesceImages();
foreach($images as $frame){
$img = new Imagick();
$img->readImageBlob($frame);
$img->cropImage($crop_w, $crop_h, $crop_x, $crop_y);
$img->thumbnailImage( $width, $height, true );
$canvas->addImage( $img );
$canvas->setImageDelay( $img->getImageDelay() );
$canvas->setImagePage($width, $height, 0, 0);
}
}
else
{
$image->cropImage($crop_w, $crop_h, $crop_x, $crop_y);
$image->thumbnailImage( $width, $height, true );
$canvas->addImage( $image );
$canvas->setImagePage($width, $height, 0, 0);
}
$image->destroy();
$this->image = $canvas;
}
}
// 添加水印图片 这个为未其他用途，针对二维码请看下一个添加水印
public function add_watermark($path, $x = 0, $y = 0)
{
$watermark = new Imagick($path);
$draw = new ImagickDraw();
$draw->composite($watermark->getImageCompose(), $x, $y, $watermark->getImageWidth(), $watermark->getimageheight(), $watermark);
if($this->type=='gif')
{
$image = $this->image;
$canvas = new Imagick();
$images = $image->coalesceImages();
foreach($image as $frame)
{
$img = new Imagick();
$img->readImageBlob($frame);
$img->drawImage($draw);
$canvas->addImage( $img );
$canvas->setImageDelay( $img->getImageDelay() );
}
$image->destroy();
$this->image = $canvas;
}
else
{
$this->image->drawImage($draw);
}
}
// 添加水印文字
public function add_text($text, $x = 0 , $y = 0, $angle=0, $style=array())
{
$draw = new ImagickDraw();
if(isset($style['font'])) $draw->setFont($style['font']);
if(isset($style['font_size'])) $draw->setFontSize($style['font_size']);
if(isset($style['fill_color'])) $draw->setFillColor($style['fill_color']);
if(isset($style['under_color'])) $draw->setTextUnderColor($style['under_color']);
if($this->type=='gif')
{
foreach($this->image as $frame)
{
$frame->annotateImage($draw, $x, $y, $angle, $text);
}
}
else
{
$this->image->annotateImage($draw, $x, $y, $angle, $text);
}
}
// 保存到指定路径
public function save_to( $path )
{
if($this->type=='gif')
{
$this->image->writeImages($path, true);
}
else
{
$this->image->writeImage($path);
}
}
// 输出图像
public function output($header = true)
{
if($header) header('Content-type: '.$this->type);
echo $this->image->getImagesBlob();
}
// 添加水印图片 针对二维码
public function get_img($path, $x = 0, $y = 0,$qie=false)
{ //jerry 20131101
$watermark = new Imagick($path);
if($qie==true){$watermark->thumbnailImage(92,92,true);
$height= $watermark->getimageheight();//获取图片高度
$width= $watermark->getImageWidth();//获取图片宽度
if($height!=92)$y=$y+(92-$height)/2;//居中处理
if($width!=92)$x=$x+(92-$width)/2;//居中处理
}//生成缩略图
else{$watermark->thumbnailImage(104,104,true);
$x=$x-6;$y=$y-6;
}//生成缩略图
//以上的92和104均为宽高，可自行设置或作为值传到get_img()，这个请自由发挥。
//$watermark->setImageResolution(0.01,0.03);//分辨率
/*如果不需要圆边？那就用下面这个直接生成带边线的也行*/
//$color='rgb(220, 220, 220)';
//$color=new ImagickPixel();
//$color->setColor($color);
//$watermark->borderImage('rgb(225,255,255)', 2, 2); //内边白边
//$watermark->borderImage($color, 1, 1); //加边外边灰线
$draw = new ImagickDraw();
$draw->composite($watermark->getImageCompose(), $x, $y, $watermark->getImageWidth(), $watermark->getimageheight(), $watermark); //合并
if($this->type=='gif')
{
$image = $this->image;
$canvas = new Imagick();
$images = $image->coalesceImages();
foreach($image as $frame)
{
$img = new Imagick();
$img->readImageBlob($frame);
$img->drawImage($draw);
$canvas->addImage( $img );
$canvas->setImageDelay( $img->getImageDelay() );
}
$image->destroy();
$this->image = $canvas;
}
else
{
$this->image->drawImage($draw);
}
///////////
}
public function get_width()
{
$size = $this->image->getImagePage();
return $size['width'];
}
public function get_height()
{
$size = $this->image->getImagePage();
return $size['height'];
}
// 设置图像类型， 默认与源类型一致
public function set_type( $type='png' )
{
$this->type = $type;
$this->image->setImageFormat( $type );
}
// 获取源图像类型
public function get_type()
{
return $this->type;
}
// 当前对象是否为图片
public function is_image()
{
if( $this->image )
return true;
else
return false;
}
public function thumbnail($width = 100, $height = 100, $fit = true){ $this->image->thumbnailImage( $width, $height, $fit );} // 生成缩略图 $fit为真时将保持比例并在安全框 $width X $height 内生成缩略图片
/*
添加一个边框
$width: 左右边框宽度
$height: 上下边框宽度
$color: 颜色: RGB 颜色 'rgb(255,0,0)' 或 16进制颜色 '#FF0000' 或颜色单词 'white'/'red'...
*/
public function border($width, $height, $color='rgb(220, 220, 220)')
{
$color=new ImagickPixel();
$color->setColor($color);
$this->image->borderImage($color, $width, $height);
}
}
?>
