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
extension=PHP_imagick.dll ，重启web server
二、linux下安装Imagick扩展：
1.yum安装ImageMagick
yum install ImageMagick ImageMagick-devel
2.测试是否安装成功
convert -version
3.安装imagick扩展
01.wget http://pecl.PHP.net/get/imagick-3.1.0RC2.tgz02.tar xzvf imagick-3.1.0RC2.tgz03.cd imagick-3.1.0RC204.PHPize05../configure06.make07.make install
extension=imagick.so
5. 重新启动apache服务器
service httpd restart
三、案例
1. 边框处理
PHP_imagick程序示例
1.创建一个缩略图并显示出来
2.创建一个目录下的缩略图，并保存
3.缩略GIF动画图片
示例：
调用方式:
// 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,0);
}
$image->destroy();
$this->image = $canvas;
}
else
{
$this->image->cropImage($width,$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
$fit = 图像方位值 时,输出指定位置部分图像
字母与图像的对应关系如下:
west center east
south_west south south_east
*/
public function resize_to($width = 100,$height = 100,$fit = 'center',$fill_color = array(255,0) )
{
switch($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,false );
$canvas->addImage( $img );
$canvas->setimageDelay( $img->getimageDelay() );
}
$image->destroy();
$this->image = $canvas;
}
else
{
$this->image->thumbnailImage( $width,false );
}
break;
case 'scale':
if($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,true );
$canvas->addImage( $img );
$canvas->setimageDelay( $img->getimageDelay() );
}
$image->destroy();
$this->image = $canvas;
}
else
{
$this->image->thumbnailImage( $width,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,true );
$draw = new ImagickDraw();
$draw->composite($frame->getimageCompose(),$y,$dst_width,$dst_height,$frame);
$img = new Imagick();
$img->newImage($width,$color,'gif');
$img->drawImage($draw);
$canvas->addImage( $img );
$canvas->setimageDelay( $img->getimageDelay() );
$canvas->setimagePage($width,0);
}
}
else
{
$image->thumbnailImage( $width,true );
$draw = new ImagickDraw();
$draw->composite($image->getimageCompose(),$image);
$canvas->newImage($width,$this->get_type() );
$canvas->drawImage($draw);
$canvas->setimagePage($width,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,true );
$canvas->addImage( $img );
$canvas->setimageDelay( $img->getimageDelay() );
$canvas->setimagePage($width,0);
}
}
else
{
$image->cropImage($crop_w,$crop_y);
$image->thumbnailImage( $width,true );
$canvas->addImage( $image );
$canvas->setimagePage($width,0);
}
$image->destroy();
$this->image = $canvas;
}
}
// 添加水印图片
public function add_watermark($path,$x = 0,$y = 0)
{
$watermark = new Imagick($path);
$draw = new ImagickDraw();
$draw->composite($watermark->getimageCompose(),$watermark->getimageWidth(),$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($text,$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,$angle,$text);
}
}
else
{
$this->image->annotateImage($draw,$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();
}
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,$fit = true){ $this->image->thumbnailImage( $width,$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
$color: 颜色: RGB 颜色 'rgb(255,0)' 或 16进制颜色 '#FF0000' 或颜色单词 'white'/'red'...
/
public function border($width,$color='rgb(220,220)')
{
$color=new ImagickPixel();
$color->setColor($color);
$this->image->borderImage($color,$width,$height);
}
public function blur($radius,$sigma){$this->image->blurImage($radius,$sigma);} // 模糊
public function gaussian_blur($radius,$sigma){$this->image->gaussianBlurImage($radius,$sigma);} // 高斯模糊
public function motion_blur($radius,$sigma,$angle){$this->image->motionBlurImage($radius,$angle);} // 运动模糊
public function radial_blur($radius){$this->image->radialBlurImage($radius);} // 径向模糊
public function add_noise($type=null){$this->image->addNoiseImage($type==null?imagick::NOISE_IMpulse:$type);} // 添加噪点
public function level($black_point,$gamma,$white_point){$this->image->levelImage($black_point,$white_point);} // 调整色阶
public function modulate($brightness,$saturation,$hue){$this->image->modulateImage($brightness,$hue);} // 调整亮度、饱和度、色调
public function charcoal($radius,$sigma){$this->image->charcoalImage($radius,$sigma);} // 素描
public function oil_paint($radius){$this->image->oilPaintimage($radius);} // 油画效果
public function flop(){$this->image->flopImage();} // 水平翻转
public function flip(){$this->image->flipImage();} // 垂直翻转
}
希望本文所述对大家的PHP程序设计有所帮助。
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