php使用imagick模块实现图片缩放、裁剪、压缩示例

php 使用imagick模块 缩放，裁剪，压缩图片 包括gif图片

缩放 裁剪

/**
  * 图片裁剪
  * 裁剪规则：
  *   1. 高度为空或为零   按宽度缩放 高度自适应
  *   2. 宽度为空或为零  按高度缩放 宽度自适应
  *      3. 宽度，高度到不为空或为零  按宽高比例等比例缩放裁剪  默认从头部居中裁剪
  * @param number $width
  * @param number $height
  */
 public function resize($width=0, $height=0){
  if($width==0 && $height==0){
   return;
  }

  $color = '';// 'rgba(255,255,255,1)';
  $size = $this->image->getimagepage ();
  //原始宽高
  $src_width = $size ['width'];
  $src_height = $size ['height'];

  //按宽度缩放 高度自适应
  if($width!=0 && $height==0){
   if($src_width>$width){
    $height = intval($width*$src_height/$src_width);

    if ($this->type == 'gif') {
     $this->_resizegif($width, $height);
    }else{
     $this->image->thumbnailimage ( $width, $height, true );
    }
   }
   return;
  }
  //按高度缩放 宽度自适应
  if($width==0 && $height!=0){
   if($src_height>$height){
    $width = intval($src_width*$height/$src_height);

    if ($this->type == 'gif') {
     $this->_resizegif($width, $height);
    }else{
     $this->image->thumbnailimage ( $width, $height, true );
    }
   }
   return;
  }

  //缩放的后的尺寸
  $crop_w = $width;
  $crop_h = $height;

  //缩放后裁剪的位置
  $crop_x = 0;
  $crop_y = 0;

  if(($src_width/$src_height) < ($width/$height)){
   //宽高比例小于目标宽高比例  宽度等比例放大      按目标高度从头部截取
   $crop_h = intval($src_height*$width/$src_width);
   //从顶部裁剪  不用计算 $crop_y
  }else{
   //宽高比例大于目标宽高比例   高度等比例放大      按目标宽度居中裁剪
   $crop_w = intval($src_width*$height/$src_height);
   $crop_x = intval(($crop_w-$width)/2);
  }

  if ($this->type == 'gif') {
   $this->_resizegif($crop_w, $crop_h, true, $width, $height,$crop_x, $crop_y);
  } else {
   $this->image->thumbnailimage ( $crop_w, $crop_h, true );
   $this->image->cropimage($width, $height,$crop_x, $crop_y);
  }
 }

针对gif图片的处理方法

/**
  * 处理gif图片 需要对每一帧图片处理
  * @param unknown $t_w  缩放宽
  * @param unknown $t_h  缩放高
  * @param string $iscrop  是否裁剪
  * @param number $c_w  裁剪宽
  * @param number $c_h  裁剪高
  * @param number $c_x  裁剪坐标 x
  * @param number $c_y  裁剪坐标 y
  */
 private function _resizegif($t_w, $t_h, $iscrop=false, $c_w=0, $c_h=0, $c_x=0, $c_y=0){
  $dest = new imagick();
  $color_transparent = new imagickpixel("transparent"); //透明色
  foreach($this->image as $img){
   $page = $img->getimagepage();
   $tmp = new imagick();
   $tmp->newimage($page['width'], $page['height'], $color_transparent, 'gif');
   $tmp->compositeimage($img, imagick::composite_over, $page['x'], $page['y']);

   $tmp->thumbnailimage ( $t_w, $t_h, true );
   if($iscrop){
    $tmp->cropimage($c_w, $c_h, $c_x, $c_y);
   }

   $dest->addimage($tmp);
   $dest->setimagepage($tmp->getimagewidth(), $tmp->getimageheight(), 0, 0);
   $dest->setimagedelay($img->getimagedelay());
   $dest->setimagedispose($img->getimagedispose());

  }
  $this->image->destroy ();
  $this->image = $dest;
 }

保存时压缩处理

// 保存到指定路径
 public function save_to($path) {
  //压缩图片质量
  $this->image->setimageformat('jpeg');
  $this->image->setimagecompression(imagick::compression_jpeg);
  $a = $this->image->getimagecompressionquality() * 0.60;
  if ($a == 0) {
   $a = 60;
  }
  $this->image->setimagecompressionquality($a);
  $this->image->stripimage();

  if ($this->type == 'gif') {
   $this->image->writeimages ( $path, true );
  } else {
   $this->image->writeimage ( $path );
  }
 }

imagickservice.php

<?php

/**
 * 图片处理服务类
 * 使用php扩展服务imagick实现
 * imagemagick 官网地址 [url]http:www.imagemagick.org/script/index.php[/url] 
 *
 * @author weiguang3
 * @since 20140403
 */
class imagickservice {
 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 ();
 }

 public function init(){

 }

 // 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;
 }

 /**
  * 图片裁剪
  * 裁剪规则：
  *   1. 高度为空或为零   按宽度缩放 高度自适应
  *   2. 宽度为空或为零  按高度缩放 宽度自适应
  *      3. 宽度，高度到不为空或为零  按宽高比例等比例缩放裁剪  默认从头部居中裁剪
  * @param number $width
  * @param number $height
  */
 public function resize($width=0, $height=0){
  if($width==0 && $height==0){
   return;
  }

  $color = '';// 'rgba(255,255,255,1)';
  $size = $this->image->getimagepage ();
  //原始宽高
  $src_width = $size ['width'];
  $src_height = $size ['height'];

  //按宽度缩放 高度自适应
  if($width!=0 && $height==0){
   if($src_width>$width){
    $height = intval($width*$src_height/$src_width);

    if ($this->type == 'gif') {
     $this->_resizegif($width, $height);
    }else{
     $this->image->thumbnailimage ( $width, $height, true );
    }
   }
   return;
  }
  //按高度缩放 宽度自适应
  if($width==0 && $height!=0){
   if($src_height>$height){
    $width = intval($src_width*$height/$src_height);

    if ($this->type == 'gif') {
     $this->_resizegif($width, $height);
    }else{
     $this->image->thumbnailimage ( $width, $height, true );
    }
   }
   return;
  }

  //缩放的后的尺寸
  $crop_w = $width;
  $crop_h = $height;

  //缩放后裁剪的位置
  $crop_x = 0;
  $crop_y = 0;

  if(($src_width/$src_height) < ($width/$height)){
   //宽高比例小于目标宽高比例  宽度等比例放大      按目标高度从头部截取
   $crop_h = intval($src_height*$width/$src_width);
   //从顶部裁剪  不用计算 $crop_y
  }else{
   //宽高比例大于目标宽高比例   高度等比例放大      按目标宽度居中裁剪
   $crop_w = intval($src_width*$height/$src_height);
   $crop_x = intval(($crop_w-$width)/2);
  }

  if ($this->type == 'gif') {
   $this->_resizegif($crop_w, $crop_h, true, $width, $height,$crop_x, $crop_y);
  } else {
   $this->image->thumbnailimage ( $crop_w, $crop_h, true );
   $this->image->cropimage($width, $height,$crop_x, $crop_y);
  }
 }

 /**
  * 处理gif图片 需要对每一帧图片处理
  * @param unknown $t_w  缩放宽
  * @param unknown $t_h  缩放高
  * @param string $iscrop  是否裁剪
  * @param number $c_w  裁剪宽
  * @param number $c_h  裁剪高
  * @param number $c_x  裁剪坐标 x
  * @param number $c_y  裁剪坐标 y
  */
 private function _resizegif($t_w, $t_h, $iscrop=false, $c_w=0, $c_h=0, $c_x=0, $c_y=0){
  $dest = new imagick();
  $color_transparent = new imagickpixel("transparent"); //透明色
  foreach($this->image as $img){
   $page = $img->getimagepage();
   $tmp = new imagick();
   $tmp->newimage($page['width'], $page['height'], $color_transparent, 'gif');
   $tmp->compositeimage($img, imagick::composite_over, $page['x'], $page['y']);

   $tmp->thumbnailimage ( $t_w, $t_h, true );
   if($iscrop){
    $tmp->cropimage($c_w, $c_h, $c_x, $c_y);
   }

   $dest->addimage($tmp);
   $dest->setimagepage($tmp->getimagewidth(), $tmp->getimageheight(), 0, 0);
   $dest->setimagedelay($img->getimagedelay());
   $dest->setimagedispose($img->getimagedispose());

  }
  $this->image->destroy ();
  $this->image = $dest;
 }

 
 /**
  * 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) {
  //压缩图片质量
  $this->image->setimageformat('jpeg');
  $this->image->setimagecompression(imagick::compression_jpeg);
  $a = $this->image->getimagecompressionquality() * 0.60;
  if ($a == 0) {
   $a = 60;
  }
  $this->image->setimagecompressionquality($a);
  $this->image->stripimage();

  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;
 }

 public function get_file_size(){
  if($this->image){
   return 0;//$this->image->getimagelength(); getimagelength not find
  }else{
   return 0;
  }
 }

 public function get_file_type(){
  if($this->image){
   return $this->image->getimagemimetype();
  }else{
   return 0;
  }
 }

 public function get_sha1(){
  if($this->image){
   return sha1($this->image->__tostring());
  }else{
   return '';
  }
 }

 // 当前对象是否为图片
 public function is_image() {
  if ($this->image)
   return true;
  else
   return false;
 }

 /*
  * 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
}