PHP 使用Imagick模块 缩放，裁剪，压缩图片 包括gif图片

缩放 裁剪

复制代码 代码如下:
/**
* 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

复制代码 代码如下:
/**
* 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

复制代码 代码如下:
// 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

复制代码 代码如下:
<?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:pressionQuality($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
}