estoy usando una versión modificada de la clase SimpleImage.php: http://www.white-hat-web-design.co.uk/articles/php-image-resizing.phpPNG Transparencia de cambio de tamaño con SimpleImage.php Clase
Las ediciones que he encontrado en phpfreaks (http://www.phpfreaks.com/forums/index.php?topic=301811.0), pero cuando se utiliza, el png Obtiene cambiar de tamaño, pero la transparencia es negra
que hacer la llamada como:
$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);
no estoy seguro de lo que falta. Cualquier ayuda se agradece ...
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;
}
}
¡Gracias por el código! ¡Me ahorró mucho tiempo! Edité una pequeña parte de tu código porque $ new_image en la función save() es una variable indefinida –