Я использую модифицированную версию класса SimpleImage.php: http://www.white-hat-web-design.co.uk/articles/php-image-resizing.php
Редакции, которые я нашел на phpfreaks ( http://www.phpfreaks.com/forums/index.php?topic=301811.0 ), но когда я использую, png изменяется, но прозрачность черная.
Я звоню так:
$max_width = 200; // set a max width $max_height = 150; // set a max height if($imgW > $imgH){ // width is greater // resize to width up to max if($imgW > $max_width) $image->resizeToWidth($max_width); } else { // height is greater // resize to height up to max if($imgH > $max_height) $image->resizeToHeight($max_height); } $image->save($_SERVER['DOCUMENT_ROOT']."/path/" . $new_filename); Я не уверен, чего не хватает. Любая помощь приветствуется …
class SimpleImage { var $image; var $image_type; function load($filename) { $image_info = getimagesize($filename); $this->image_type = $image_info[2]; if( $this->image_type == IMAGETYPE_JPEG ) { $this->image = imagecreatefromjpeg($filename); } elseif( $this->image_type == IMAGETYPE_GIF ) { $this->image = imagecreatefromgif($filename); } elseif( $this->image_type == IMAGETYPE_PNG ) { $this->image = imagecreatefrompng($filename); } } function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null) { if( $image_type == IMAGETYPE_JPEG ) { imagejpeg($this->image,$filename,$compression); } elseif( $image_type == IMAGETYPE_GIF ) { imagegif($this->image,$filename); } elseif( $image_type == IMAGETYPE_PNG ) { imagepng($this->image,$filename); } if( $permissions != null) { chmod($filename,$permissions); } } function output($image_type=IMAGETYPE_JPEG) { if( $image_type == IMAGETYPE_JPEG ) { imagejpeg($this->image); } elseif( $image_type == IMAGETYPE_GIF ) { imagegif($this->image); } elseif( $image_type == IMAGETYPE_PNG ) { imageAlphaBlending($this->image, true); imageSaveAlpha($this->image, true); imagepng($this->image); } } function getWidth() { return imagesx($this->image); } function getHeight() { return imagesy($this->image); } function resizeToHeight($height) { $ratio = $height / $this->getHeight(); $width = $this->getWidth() * $ratio; $this->resize($width,$height); } function resizeToWidth($width) { $ratio = $width / $this->getWidth(); $height = $this->getheight() * $ratio; $this->resize($width,$height); } function scale($scale) { $width = $this->getWidth() * $scale/100; $height = $this->getheight() * $scale/100; $this->resize($width,$height); } function resize($width,$height) { // ADDED CODE IS HERE - NOT SURE WHY IT DOESN'T WORK FOR PNG // Setup new image $new_image = imagecreatetruecolor($width, $height); // These parameters are required for handling PNG files. imagealphablending($new_image, false); imagesavealpha($new_image,true); $transparent = imagecolorallocatealpha($new_image, 255, 255, 255, 127); imagefilledrectangle($new_image, 0, 0, $width, $height, $transparent); // Resize image imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight()); $this->image = $new_image; } }
Теперь прозрачность работает для PNG, но не gif. Вот отредактируйте конкретные функции, если это поможет кому-то другому:
Сохранить функцию:
function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null) { // do this or they'll all go to jpeg $image_type=$this->image_type; if( $image_type == IMAGETYPE_JPEG ) { imagejpeg($this->image,$filename,$compression); } elseif( $image_type == IMAGETYPE_GIF ) { imagegif($this->image,$filename); } elseif( $image_type == IMAGETYPE_PNG ) { // need this for transparent png to work imagealphablending($this->image, false); imagesavealpha($this->image,true); imagepng($this->image,$filename); } if( $permissions != null) { chmod($filename,$permissions); }
}
Функция изменения размера
function resize($width,$height,$forcesize='n') { /* optional. if file is smaller, do not resize. */ if ($forcesize == 'n') { if ($width > $this->getWidth() && $height > $this->getHeight()){ $width = $this->getWidth(); $height = $this->getHeight(); } } $new_image = imagecreatetruecolor($width, $height); /* Check if this image is PNG or GIF, then set if Transparent*/ if(($this->image_type == IMAGETYPE_GIF) || ($this->image_type==IMAGETYPE_PNG)){ imagealphablending($new_image, false); imagesavealpha($new_image,true); $transparent = imagecolorallocatealpha($new_image, 255, 255, 255, 127); imagefilledrectangle($new_image, 0, 0, $width, $height, $transparent); } imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight()); $this->image = $new_image;
}
Функция imagecreatetruecolor() не работает с GIF. Вместо этого используйте метод imagecreate :
if($this->image_type == IMAGETYPE_GIF){ $new_image = imagecreate( $Width, $Height ); // for gif files } else{ $new_image = imagecreatetruecolor($Width, $Height); // for all other files }
Я давно не играл с GD (предпочитаю Imagemagick), но вы можете попробовать настроить альфа-версию на исходное изображение перед копированием:
... // ADDED CODE IS HERE .. imagealphablending($this->image, true); ...
НТН.
Я сделал то же самое, что и в этом https://stackoverflow.com/a/6401135/262462, но отредактировал эту часть
function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null) { // do this or they'll all go to jpeg $image_type=$this->image_type;
к этому
function save($filename, $image_type="original", $compression=75, $permissions=null) { if ($image_type=="original") $image_type=$this->image_type;