本篇文章为大家展示了如何在php中利用imagick模块实现一个图片缩放功能，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。
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: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
}
上述内容就是如何在php中利用imagick模块实现一个图片缩放功能，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注亿速云行业资讯频道。
免责声明：本站发布的内容（图片、视频和文字）以原创、转载和分享为主，文章观点不代表本网站立场，如果涉及侵权请联系站长邮箱：is@yisu.com进行举报，并提供相关证据，一经查实，将立刻删除涉嫌侵权内容。
