使用codeigniter图像lib - 转换图像

Question

使用codeigniter图像lib有可能只更改图像类型？尝试从* - > PNG转换。

以下不起作用！

$config = array(); 
$config['source_image']='uploads/'.$name.'.'.$m[1]; 
$config['new_image']='uploads/'.$name.'.'.$png; 
$objImage = new CI_Image_lib($config); 

非常感谢！所有帮助非常感谢！

---

目前只是使用，但想使用图像库和支持所有图像类型。

$sourceImage = imagecreatefromjpeg('uploads/'.$name.'.'.$m[1]); 
imagepng($sourceImage, 'uploads/'.$name.'.png'); 

Answer 1

我认为你必须使用ImageMagick

$config['image_library'] = 'ImageMagick'; 
$config['library_path']='/usr/bin'; 
$config['source_image']='uploads/'.$name.'.'.$m[1]; 
$config['new_image']='uploads/'.$name.'.'.$png; 
$objImage = new CI_Image_lib($config); 

Answer 2

阅读许多不同的解决方案后，我决定放弃对CodeIgniter的库，而使用给出here （最初发布一个非常简单的类在http://www.white-hat-web-design.co.uk/blog/resizing-images-with-php/但在此期间被删除）。

粘贴在这里为后人：

<?php 
/* * File: SimpleImage.php * Author: Simon Jarvis * Copyright: 2006 Simon Jarvis * Date: 08/11/06 * Link: http://www.white-hat-web-design.co.uk/articles/php-image-resizing.php * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details: * http://www.gnu.org/licenses/gpl.html * */ 
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 ($image_type == IMAGETYPE_PNG) { 
      imagepng($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) 
    { 
     $new_image = imagecreatetruecolor($width, $height); 
     imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight()); 
     $this->image = $new_image; 
    } 
} 
?> 

对于基于CI扩展，请看这里：http://www.robertmullaney.com/2010/09/18/codeigniter-image_lib-convert-jpg-gif-png/