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php-imagick实现图片剪切、旋转、锐化、减色或增加方法

时间:2024-10-28 16:05:37 php语言 我要投稿
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php-imagick实现图片剪切、旋转、锐化、减色或增加方法

  我们可以通过php_imagick实现图片剪切、旋转、锐化、减色或增加,下面是小编给大家提供的实现方法,大家可以参考阅读,更多详情请关注应届毕业生考试网。

  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

  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

  service httpd restart

  三、案例

  1. 边框处理

  复制代码 代码如下:

  header('Content-type: image/jpeg');

  $image = new Imagick('test.jpg');

  $color=new ImagickPixel();

  $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

  复制代码 代码如下:

  <?php

  header('Content-type: image/jpeg');

  $image = new Imagick('image.jpg');

  // If 0 is provided as a width or height parameter,// aspect ratio is maintained

  $image->thumbnailImage(100, 0);

  echo $image;

  ?>

  2.创建一个目录下的缩略图,并保存

  复制代码 代码如下:

  <?php

  $images = new Imagick(glob('images/*.JPG'));

  foreach($images as $image) {

  // Providing 0 forces thumbnailImage to maintain aspect ratio

  $image->thumbnailImage(1024,0);

  }

  $images->writeImages();

  ?>

  3.缩略GIF动画图片

  复制代码 代码如下:

  <?php

  /* Create a new imagick object and read in GIF */

  $im = new Imagick("example.gif");

  /* Resize all frames */

  foreach ($im as $frame) {

  /* 50x50 frames */

  $frame->thumbnailImage(50, 50);

  /* Set the virtual canvas to correct size */

  $frame->setImagePage(50, 50, 0, 0);

  }/* Notice writeImages instead of writeImage */

  $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:

  复制代码 代码如下:

  include 'imagick.class.php';

  $image = new lib_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

  class lib_image_imagick

  {

  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

  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();

  }

  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);

  }

  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, $sigma, $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, $gamma, $white_point);} // 调整色阶

  public function modulate($brightness, $saturation, $hue){$this->image->modulateImage($brightness, $saturation, $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

  }

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