php 图片处理库,（PHP版）处理图片的类库

GD库，很强大，不过对其使用非常熟练的为数不多，对于处理 jpg 之类的图片好像没有任何问题，但是出现了gif 动画图片怎么办？对于裁减 gif 动画图片，本人至今在GD库中没有找到一个合适且完美的解决方案。

也许正是因为GD库的功能比较基础，而出现了Imagick 这个 php 扩展库。注意是：Imagick，而不是 ImageMagick，也不是 MagickWand .

Imagick ：是php的扩展库与其他两个没有任何关系，只是名字长的有点像，功能也有点类似。ImageMagick ： 是Windows/Mac/Unix/Linux系统上的一款应用程序，属于图像处理软件。

MagickWand  ：是ImageMagick的程序接口，php 当下如此流行，也不例外，提供有 PHP 的扩展，要使用此类库，需专门安装此扩展，且必须在系统上已经安装

这些天整理了一个兼容处理 Gif , jpg 等图片的类，只需简单的传入参数即可以对图片进行处理，此类是基于 Imagick 扩展的，因此使用前请先安装 Imagick 扩展。

/**

* 图片文件处理库(需要PHP环境安装有Imagick扩展)

* 说明：完美兼容gif动画、jpg等图片

* 如有任何错误，请指正！

* @version 1.0(2012-11-17)

* @author WiFeng(admin@521-wf.com)

* @link http://521-wf.com

*/

class Image {

private $oriImage; //原始图片

private $desImage; //生成图片

private $imgType; //图片类型

const DRAWTYPE_SCALE = 1;

const DRAWTYPE_FILL = 2;

const DRAWTYPE_SCALE_FILL = 3;

const FITPOS_LEFT = 1;

const FITPOS_RIGHT = 2;

const FITPOS_TOP = 3;

const FITPOS_BOTTOM = 4;

const FITPOS_LEFT_TOP = 5;

const FITPOS_LEFT_BOTTOM = 6;

const FITPOS_RIGHT_TOP = 7;

const FITPOS_RIGHT_BOTTOM = 8;

const FITPOS_CENTER = 9;

public function __construct($oriFilename) {

$this->Image ( $oriFilename );

}

/**

* @param string $oriFilename 原始图片路径

*/

public function Image($oriFilename) {

$this->oriImage = $this->desImage = new Imagick ( $oriFilename );

$this->desImage = new Imagick ();

$this->imgType = strtolower ( $this->oriImage->getImageFormat () );

}

/**

* 图片裁减

*/

public function crop($x = 0, $y = 0, $width = NULL, $height = NULL) {

if ($width === NULL) {

$width = $this->oriImage->getImageWidth () - $x;

}

if ($height === NULL) {

$height = $this->oriImage->getImageHeight () - $y;

}

if ($width < 1 || $height < 1) {

return NULL;

}

if ($this->imgType == 'gif') {

$images = $this->oriImage->coalesceImages ();

foreach ( $images as $frame ) {

$img = new Imagick ();

$img->readImageBlob ( $frame );

$img->cropImage ( $width, $height, $x, $y );

$this->desImage->addImage ( $img );

$this->desImage->setImageDelay ( $img->getImageDelay () );

$this->desImage->setImagePage ( $width, $height, 0, 0 );

}

$this->oriImage->destroy ();

} else {

$this->oriImage->cropImage ( $width, $height, $x, $y );

$this->desImage = $this->oriImage;

}

}

/**

* 调整图片大小

* @param int $width

* @param int $height

* @param string $drawType 渲染图像方式

* DRAWTYPE_SCALE 按照图片实际宽高比例调整

* DRAWTYPE_FILL 按照指定宽高调整

* DRAWTYPE_SCALE_FILL 按照图片实际宽高比例调整，空白区域使用设置的色彩与位置进行处理

* @param string $fitPosition 真实图片在调整后的方位(在$drawType=DRAWTYPE_SCALE_FILL时有效)

* (top | bottom | left | right | left_top, left_bottom, right_top, right_bottom)

* @param array $fillBgcolor 填充背景色彩(在$drawType=DRAWTYPE_SCALE_FILL时有效， array(R, G, B)

*/

public function resize($width, $height, $drawType = self::DRAWTYPE_SCALE, $fitPos = self::FITPOS_CENTER, $fillBgcolor = array(255,255,255)) {

$imagePage = $this->oriImage->getImagePage ();

$img_width = $imagePage ['width'];

$img_height = $imagePage ['height'];

$fit = true;

$crop_x = 0;

$crop_y = 0;

$crop_width = $img_width;

$crop_height = $img_height;

$color = 'rgb(0,0,255)';

switch ($drawType) {

case self::DRAWTYPE_SCALE :

$fit = true;

break;

case self::DRAWTYPE_FILL :

$fit = false;

$crop_width = $width;

$crop_height = $height;

break;

case self::DRAWTYPE_SCALE_FILL :

$fit = true;

$color = 'rgb(' . $fillBgcolor [0] . ',' . $fillBgcolor [1] . ',' . $fillBgcolor [2] . ')';

if ($width < $img_width || $height < $img_height) {

$p = 1;

$p1 = $width / $img_width;

$p2 = $height / $img_height;

$p = $p1 > $p2 ? $p2 : $p1;

$crop_width = floor ( $img_width * $p );

$crop_height = floor ( $img_height * $p );

}

switch ($fitPos) {

case self::FITPOS_CENTER :

$crop_x = floor ( ($width - $crop_width) / 2 );

$crop_y = floor ( ($height - $crop_height) / 2 );

break;

case self::FITPOS_LEFT :

$crop_y = floor ( ($height - $crop_height) / 2 );

break;

case self::FITPOS_RIGHT :

$crop_x = $width - $crop_width;

$crop_y = floor ( ($height - $crop_height) / 2 );

break;

case self::FITPOS_TOP :

$crop_x = floor ( ($width - $crop_width) / 2 );

break;

case self::FITPOS_BOTTOM :

$crop_x = floor ( ($width - $crop_width) / 2 );

$crop_y = $height - $crop_height;

break;

case self::FITPOS_LEFT_TOP :

break;

case self::FITPOS_LEFT_BOTTOM :

$crop_y = $height - $crop_height;

break;

case self::FITPOS_RIGHT_TOP :

$crop_x = $width - $crop_width;

break;

case self::FITPOS_RIGHT_BOTTOM :

$crop_x = $width - $crop_width;

$crop_y = $height - $crop_height;

break;

}

break;

}

if ($this->imgType == 'gif') {

$images = $this->oriImage->coalesceImages ();

foreach ( $images as $frame ) {

$img = new Imagick ();

$img->readImageBlob ( $frame );

$img->thumbnailImage ( $crop_width, $crop_height, $fit );

if ($drawType == self::DRAWTYPE_SCALE_FILL) {

$draw = new ImagickDraw ();

$draw->composite ( Imagick::COMPOSITE_OVER, $crop_x, $crop_y, $crop_width, $crop_height, $img );

$im = new Imagick ();

$im->newImage ( $width, $height, new ImagickPixel ( $color ), $this->imgType );

$im->drawImage ( $draw );

}

$this->desImage->addImage ( $im );

$this->desImage->setImageDelay ( $img->getImageDelay () );

}

$this->oriImage->destroy ();

} else {

$this->oriImage->thumbnailImage ( $width, $height, $fit );

if ($drawType == self::DRAWTYPE_SCALE_FILL) {

$draw = new ImagickDraw ();

$draw->composite ( Imagick::COMPOSITE_OVER, $crop_x, $crop_y, $crop_width, $crop_height, $this->oriImage );

$im = new Imagick ();

$im->newImage ( $width, $height, new ImagickPixel ( $color ), $this->imgType );

$im->drawImage ( $draw );

}

$this->desImage = $im;

}

}

/**

* 直接输出

*/

public function output() {

header ( 'Content-type: ' . $this->imgType );

echo $this->desImage->getImagesBlob ();

}

/**

* 保存图片

* @param string $filename 要生成的图片路径

* @return boolean

*/

public function save($filename, $replace = false) {

if (file_exists ( $filename )) {

if (! $replace) {

echo "The File [$filename] is exists!";

return NULL;

}

unlink ( $filename );

}

if ($this->imgType == 'gif') {

$filename .= '.gif';

$flag = $this->desImage->writeImages ( $filename, true );

return $flag && rename ( $filename, substr ( $filename, 0, - 4 ) );

} else {

return $this->desImage->writeImage ( $filename );

}

}

/**

* 释放资源

*/

public function destroy() {

$this->oriImage->destroy ();

$this->desImage->destroy ();

}

}

?>

如何使用，请看下面：

require 'Image.php';

$img1 = new Image('example_1.jpg');

$img2 = new Image('example_2.jpg');

//调整图片大小

//$img1->resize(700, 300, Image::DRAWTYPE_SCALE_FILL, Image::FITPOS_RIGHT_BOTTOM, array(255, 0, 0, 0));

//$img1->save('a_111.jpg', true);

//$img1->output();

//裁减图片

$img2->crop(20, 20);

$img2->output();

?>