php_imagick实现图片剪切、旋转、锐化、减色或增加特效的方法
本文实例讲述了php_imagick实现图片剪切、旋转、锐化、减色或增加特效的方法。分享给大家供大家参考。具体分析如下：
一个可以供PHP调用ImageMagick功能的PHP扩展。使用这个扩展可以使PHP具备和ImageMagick相同的功能。
ImageMagick是一套功能强大、稳定而且免费的工具集和开发包，可以用来读、写和处理超过185种基本格式的图片文件，包括流行的TIFF,JPEG,GIF,PNG,PDF以及PhotoCD等格式。利用ImageMagick，你可以根据web应用程序的需要动态生成图片,还可以对一个（或一组）图片进行改变大小、旋转、锐化、减色或增加特效等操作，并将操作的结果以相同格式或其它格式保存。
php_imagick是PHP对图片处理的一个扩展包，可以完成对图片改变大小、旋转、锐化、减色或增加特效等操作。
一、windows下安装Imagick扩展：
1、下载ImageMagick并安装
http://image_magick.veidrodis.com/image_magick/binaries/ImageMagick-6.6.2-10-Q16-windows-dll.exe
2、下载php_imagick.dll
http://valokuva.org/outside-blog-content/imagick-windows-builds/php53/imagick-2.3.0-dev/vc9_nts/php_imagick.dll
如果你用的是线程安全的php，请下载
http://valokuva.org/outside-blog-content/imagick-windows-builds/php53/imagick-2.3.0-dev/vc9_zts/php_imagick.dll
3、设置
在php.ini中添加
extension=php_imagick.dll，重启webserver
二、linux下安装Imagick扩展：
1.yum安装ImageMagick
yuminstallImageMagickImageMagick-devel
2.测试是否安装成功
convert-version
3.安装imagick扩展
01.wgethttp://pecl.php.net/get/imagick-3.1.0RC2.tgz02.tarxzvfimagick-3.1.0RC2.tgz03.cdimagick-3.1.0RC204.phpize05../configure06.make07.makeinstall
4.编辑php.ini文件，在文件末尾添加如下代码
extension=imagick.so
5.重新启动apache服务器
servicehttpdrestart
三、案例
1.边框处理
header('Content-type:image/jpeg');
$image=newImagick('test.jpg');
$color=newImagickPixel();
$color->setColor("rgb(220,220,220)");
$image->borderImage($color,5,4);
$image->blurImage(5,5,imagick::CHANNEL_GREEN);
echo$image;我们先来看个简单的实例
php_imagick程序示例
1.创建一个缩略图并显示出来
<?php
header('Content-type:image/jpeg');
$image=newImagick('image.jpg');
//If0isprovidedasawidthorheightparameter,//aspectratioismaintained
$image->thumbnailImage(100,0);
echo$image;
?>2.创建一个目录下的缩略图，并保存
<?php
$images=newImagick(glob('images/*.JPG'));
foreach($imagesas$image){
//Providing0forcesthumbnailImagetomaintainaspectratio
$image->thumbnailImage(1024,0);
}
$images->writeImages();
?>3.缩略GIF动画图片
<?php
/*CreateanewimagickobjectandreadinGIF*/
$im=newImagick("example.gif");
/*Resizeallframes*/
foreach($imas$frame){
/*50x50frames*/
$frame->thumbnailImage(50,50);
/*Setthevirtualcanvastocorrectsize*/
$frame->setImagePage(50,50,0,0);
}/*NoticewriteImagesinsteadofwriteImage*/
$im->writeImages("example_small.gif",true);
?>现在我们进入正题吧，
示例：
裁切/生成缩略图/添加水印,自动检测和处理GIF
调用方式:
include'imagick.class.php';
$image=newlib_image_imagick();
$image->open('a.gif');
$image->resize_to(100,100,'scale_fill');
$image->add_text('1024i.com',10,20);
$image->add_watermark('1024i.gif',10,50);
$image->save_to('x.gif');
imagick.class.php
<?php classlib_image_imagick { private$image=null; private$type=null; //构造函数 publicfunction__construct(){} //析构函数 publicfunction__destruct() { if($this->image!==null)$this->image->destroy(); } //载入图像 publicfunctionopen($path) { $this->image=newImagick($path); if($this->image) { $this->type=strtolower($this->image->getImageFormat()); } return$this->image; } publicfunctioncrop($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=newImagick(); $images=$image->coalesceImages(); foreach($imagesas$frame){ $img=newImagick(); $img->readImageBlob($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 $fit:适应大小方式 'force':把图片强制变形成$widthX$height大小 'scale':按比例在安全框$widthX$height内缩放图片,输出缩放后图像大小不完全等于$widthX$height 'scale_fill':按比例在安全框$widthX$height内缩放图片，安全框内没有像素的地方填充色,使用此参数时可设置背景填充色$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$widthX$height像素大小 $fit='force','scale','scale_fill'时：输出完整图像 $fit=图像方位值时,输出指定位置部分图像 字母与图像的对应关系如下: north_west north north_east west center east south_west south south_east */ publicfunctionresize_to($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=newImagick(); $images=$image->coalesceImages(); foreach($imagesas$frame){ $img=newImagick(); $img->readImageBlob($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(); $canvas=newImagick(); foreach($imagesas$frame){ $img=newImagick(); $img->readImageBlob($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=newImagick(); $color='rgba('.$fill_color[0].','.$fill_color[1].','.$fill_color[2].','.$fill_color[3].')'; if($this->type=='gif') { $images=$image->coalesceImages(); foreach($imagesas$frame) { $frame->thumbnailImage($width,$height,true); $draw=newImagickDraw(); $draw->composite($frame->getImageCompose(),$x,$y,$dst_width,$dst_height,$frame); $img=newImagick(); $img->newImage($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=newImagickDraw(); $draw->composite($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; $canvas=newImagick(); if($this->type=='gif') { $images=$image->coalesceImages(); foreach($imagesas$frame){ $img=newImagick(); $img->readImageBlob($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 publicfunctionadd_watermark($path,$x=0,$y=0) { $watermark=newImagick($path); $draw=newImagickDraw(); $draw->composite($watermark->getImageCompose(),$x,$y,$watermark->getImageWidth(),$watermark->getimageheight(),$watermark); if($this->type=='gif') { $image=$this->image; $canvas=newImagick(); $images=$image->coalesceImages(); foreach($imageas$frame) { $img=newImagick(); $img->readImageBlob($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 publicfunctionadd_text($text,$x=0,$y=0,$angle=0,$style=array()) { $draw=newImagickDraw(); if(isset($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($this->imageas$frame) { $frame->annotateImage($draw,$x,$y,$angle,$text); } } else { $this->image->annotateImage($draw,$x,$y,$angle,$text); } } //保存到指定路径 publicfunctionsave_to($path) { if($this->type=='gif') { $this->image->writeImages($path,true); } else { $this->image->writeImage($path); } } //输出图像 publicfunctionoutput($header=true) { if($header)header('Content-type:'.$this->type); echo$this->image->getImagesBlob(); } publicfunctionget_width() { $size=$this->image->getImagePage(); return$size['width']; } publicfunctionget_height() { $size=$this->image->getImagePage(); return$size['height']; } //设置图像类型，默认与源类型一致 publicfunctionset_type($type='png') { $this->type=$type; $this->image->setImageFormat($type); } //获取源图像类型 publicfunctionget_type() { return$this->type; } //当前对象是否为图片 publicfunctionis_image() { if($this->image) returntrue; else returnfalse; } publicfunctionthumbnail($width=100,$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$widthX$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 $color:颜色:RGB颜色'rgb(255,0,0)'或16进制颜色'#FF0000'或颜色单词'white'/'red'... */ publicfunctionborder($width,$height,$color='rgb(220,220,220)') { $color=newImagickPixel(); $color->setColor($color); $this->image->borderImage($color,$width,$height); } publicfunctionblur($radius,$sigma){$this->image->blurImage($radius,$sigma);}//模糊 publicfunctiongaussian_blur($radius,$sigma){$this->image->gaussianBlurImage($radius,$sigma);}//高斯模糊 publicfunctionmotion_blur($radius,$sigma,$angle){$this->image->motionBlurImage($radius,$sigma,$angle);}//运动模糊 publicfunctionradial_blur($radius){$this->image->radialBlurImage($radius);}//径向模糊 publicfunctionadd_noise($type=null){$this->image->addNoiseImage($type==null?imagick::NOISE_IMPULSE:$type);}//添加噪点 publicfunctionlevel($black_point,$gamma,$white_point){$this->image->levelImage($black_point,$gamma,$white_point);}//调整色阶 publicfunctionmodulate($brightness,$saturation,$hue){$this->image->modulateImage($brightness,$saturation,$hue);}//调整亮度、饱和度、色调 publicfunctioncharcoal($radius,$sigma){$this->image->charcoalImage($radius,$sigma);}//素描 publicfunctionoil_paint($radius){$this->image->oilPaintImage($radius);}//油画效果 publicfunctionflop(){$this->image->flopImage();}//水平翻转 publicfunctionflip(){$this->image->flipImage();}//垂直翻转 }