resize (edit) of picture

[anatak]

Does anybody know if it is possible to resize and save the resized version of a picture with php ?

I am not talking about resizing a picture (that keeps the same filesize) but editing the picture like making a thumbnail from a full size picture.

 

When I look for resizing with php I always get scripts that do not save the smaller picture.

 

kind regards

anatak

[ignace]

http://mediumexposure.com/techblog/smart-image-resizing-while-preserving-transparency-php-and-gd-library

 

Pass 'return' as $output it will return the resized image as an gd image object.

 

Or use this script: http://www.vipercreations.com/tutorials/PHP/22/

[FrankA]

Yeah it's possible. http://us3.php.net/manual/en/function.imagecopyresampled.php  I found this and it helped me do everything I needed to do. It has some great code samples and I found it pretty easy to follow. Good luck!

 

-Frank

[anatak]

thank you both.

I will look into the scripts this weekend.

 

[Alex]

I actually made a class that does exactly this. It's pretty good for image manipulation. It could have more, but for my purposes it's more than enough.

 

<?php
class Image
{
var $image, $ext, $file;
public function __construct($im=NULL)
{
	define('CENTER', 0, true);
	define('CENTER_LEFT', 1, true);
	define('CENTER_RIGHT', 2, true);
	define('TOP_CENTER', 3, true);
	define('TOP_LEFT', 4, true);
	define('TOP_RIGHT', 5, true);
	define('BOTTOM_CENTER', 6, true);
	define('BOTTOM_LEFT', 7, true);
	define('BOTTOM_RIGHT', 8, true);

	if(empty($im)) return true;
	$info = @getimagesize($im);
	$backtrace = debug_backtrace();
	if(!$info)
		return die('<b>Fatal error:</b> \'' . $im . '\' is not a valid image resource on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	$ex = explode('/', $info['mime']);
	$this->ext = $ex[1];
	$func = 'imagecreatefrom' . $this->ext;
	$this->image = @$func($im);
	$this->file = $im;
	return true;
}
public function setImage($im)
{
	$info = @getimagesize($this->file);
	$backtrace = debug_backtrace();
	if(!$info)
		return die('<b>Fatal error:</b> \'' . $im . '\' is not a valid image resource on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	$ex = explode('/', $info['mime']);
	$this->ext = $ex[1];
	$func = 'imagecreatefrom' . $this->ext;
	$this->image = @$func($im);
	$this->file = $im;
	return true;
}
public function resize($width, $height, $porportional=FALSE, $percent=NULL, $max=NULL)
{
	$backtrace = debug_backtrace();
	if(empty($this->image)) return die('<b>Fatal error:</b> Invalid call to Image()->resize, no image is set on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	$info = Array(imagesx($this->image), imagesy($this->image));
	if($porportional)
	{
		if(empty($max) && empty($percent)) return false;
		if(empty($max))
		{
			$new_width = $info[0] * ($percent/100);
			$new_height = $info[1] * ($percent/100);
		}
		else
		{
			if($info[0] < $max && $info[1] < $max) return false;
			$new_width = ($info[0] > $info[1]) ? $max : ($info[0]/$info[1]) * $max;
			$new_height = ($info[0] > $info[1]) ? ($info[1]/$info[0]) * $max : $max;
		}
	}
	else
	{
		$new_width = $width;
		$new_height = $height;
	}
	$new_image = imagecreatetruecolor($new_width, $new_height);
	imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $new_width, $new_height, $info[0], $info[1]);
	$this->image = $new_image;
	return true;
}
public function crop($width, $height, $x, $y, $position=NULL)
{
	$backtrace = debug_backtrace();
	if(empty($this->image)) return die('<b>Fatal error:</b> Invalid call to Image()->crop, no image is set on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	$info = Array(imagesx($this->image), imagesy($this->image));
	if($width > $info[0] || $height > $info[1]) return false;
	if(!empty($position) && $position >= 0 && $position <= 
	{
		switch($position)
		{
			case CENTER:
				$x = ($info[0] - $width)/2;
				$y = ($info[1] - $height)/2;
			break;
			case CENTER_LEFT:
				$x = 0;
				$y = ($info[1] - $height)/2;
			break;
			case CENTER_RIGHT:
				$x = ($info[0] - $height);
				$y = ($info[1] - $height)/2;
			break;
			case TOP_CENTER:
				$x = ($info[0] - $width)/2;
				$y = 0;
			break;
			case TOP_LEFT:
				$x = 0;
				$y = 0;
			break;
			case TOP_RIGHT:
				$x = ($info[0] - $width);
				$y = 0;
			break;
			case BOTTOM_CENTER:
				$x = ($info[0] - $width)/2;
				$y = ($info[1] - $height);
			break;
			case BOTTOM_LEFT:
				$x = 0;
				$y = ($info[1] - $height);
			break;
			case BOTTOM_RIGHT:
				$x = ($info[0] - $width);
				$y = ($info[1] - $height);
			break;
			default:
				return false;
			break;
		}
	}
	$new_image = imagecreatetruecolor($width, $height);
	imagecopyresampled($new_image, $this->image, 0, 0, $x, $y, $width, $height, $width, $height);
	$this->image = $new_image;
	return true;
}
public function save($loc, $compression=0)
{
	$backtrace = debug_backtrace();
	if(empty($this->image)) return die('<b>Fatal error:</b> Invalid call to Image()->save, no image is set on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	$func = 'image' . $this->ext;
	return $func($this->image, $loc, $compression);
}
public function output()
{
	$backtrace = debug_backtrace();
	if(empty($this->image)) return die('<b>Fatal error:</b> Invalid call to Image()->output, no image is set on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	header('Content-type: image/' . $this->ext);
	$func = 'image' . $this->ext;
	$func($this->image);
}
}

 

For your case you could do something like..

 

<?php
require_once 'image.class.php'; //My Class
$im = new Image('/path/to/image');
$im->resize(width, height);
//Or if you want to do it by a % proportionally..
$im->resize(null, null, true, %);
$im->size('someplace.png/jpg/gif');

 

There's also a lot of other options included in the class. For example you can crop (which also offers different location, CENTER_LEFT, CENTER_RIGHT, .. 9 in total).

 

Here's the class with some documentation/examples I wrote for it:

 

http://pastesite.com/10199

[ignace]

class Image {
    var $image, $ext, $file;
    public function __construct($im=NULL)
        define('CENTER', 0, true);
        define('CENTER_LEFT', 1, true);
        define('CENTER_RIGHT', 2, true);
        define('TOP_CENTER', 3, true);
        define('TOP_LEFT', 4, true);
        define('TOP_RIGHT', 5, true);
        define('BOTTOM_CENTER', 6, true);
        define('BOTTOM_LEFT', 7, true);
        define('BOTTOM_RIGHT', 8, true);

 

Alex couldn't decide if you would write for PHP 4 or 5?

 

class Image {
    const CENTER = 0;
    ..
    
    private $image;
    private $ext;
    private $file;
    
    public function __construct($im = null)
}

[anatak]

Alex,

 

Thank you very much.

I am going to get it to work today and will report back.

 

[Alex]

Btw, you should probably use this:

 

class Image
{
private $image, $ext, $file;

const CENTER = 0, CENTER_LEFT = 1, CENTER_RIGHT = 2, TOP_CENTER = 3, TOP_LEFT = 4, TOP_RIGHT = 5, BOTTOM_CENTER = 6, BOTTOM_LEFT = 7, BOTTOM_RIGHT = 8;

public function __construct($im=NULL)
{	
	if(empty($im)) return true;
	$info = @getimagesize($im);
	$backtrace = debug_backtrace();
	if(!$info)
		return die('<b>Fatal error:</b> \'' . $im . '\' is not a valid image resource on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	$ex = explode('/', $info['mime']);
	$this->ext = $ex[1];
	$func = 'imagecreatefrom' . $this->ext;
	$this->image = @$func($im);
	$this->file = $im;
	return true;
}
public function setImage($im)
{
	$info = @getimagesize($this->file);
	$backtrace = debug_backtrace();
	if(!$info)
		return die('<b>Fatal error:</b> \'' . $im . '\' is not a valid image resource on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	$ex = explode('/', $info['mime']);
	$this->ext = $ex[1];
	$func = 'imagecreatefrom' . $this->ext;
	$this->image = @$func($im);
	$this->file = $im;
	return true;
}
public function resize($width, $height, $porportional=FALSE, $percent=NULL, $max=NULL)
{
	$backtrace = debug_backtrace();
	if(empty($this->image)) return die('<b>Fatal error:</b> Invalid call to Image()->resize, no image is set on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	$info = Array(imagesx($this->image), imagesy($this->image));
	if($porportional)
	{
		if(empty($max) && empty($percent)) return false;
		if(empty($max))
		{
			$new_width = $info[0] * ($percent/100);
			$new_height = $info[1] * ($percent/100);
		}
		else
		{
			if($info[0] < $max && $info[1] < $max) return false;
			$new_width = ($info[0] > $info[1]) ? $max : ($info[0]/$info[1]) * $max;
			$new_height = ($info[0] > $info[1]) ? ($info[1]/$info[0]) * $max : $max;
		}
	}
	else
	{
		$new_width = $width;
		$new_height = $height;
	}
	$new_image = imagecreatetruecolor($new_width, $new_height);
	imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $new_width, $new_height, $info[0], $info[1]);
	$this->image = $new_image;
	return true;
}
public function crop($width, $height, $x, $y, $position=NULL)
{
	$backtrace = debug_backtrace();
	if(empty($this->image)) return die('<b>Fatal error:</b> Invalid call to Image()->crop, no image is set on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	$info = Array(imagesx($this->image), imagesy($this->image));
	if($width > $info[0] || $height > $info[1]) return false;
	if(!empty($position) && $position >= 0 && $position <= 
	{
		switch($position)
		{
			case CENTER:
				$x = ($info[0] - $width)/2;
				$y = ($info[1] - $height)/2;
			break;
			case CENTER_LEFT:
				$x = 0;
				$y = ($info[1] - $height)/2;
			break;
			case CENTER_RIGHT:
				$x = ($info[0] - $height);
				$y = ($info[1] - $height)/2;
			break;
			case TOP_CENTER:
				$x = ($info[0] - $width)/2;
				$y = 0;
			break;
			case TOP_LEFT:
				$x = 0;
				$y = 0;
			break;
			case TOP_RIGHT:
				$x = ($info[0] - $width);
				$y = 0;
			break;
			case BOTTOM_CENTER:
				$x = ($info[0] - $width)/2;
				$y = ($info[1] - $height);
			break;
			case BOTTOM_LEFT:
				$x = 0;
				$y = ($info[1] - $height);
			break;
			case BOTTOM_RIGHT:
				$x = ($info[0] - $width);
				$y = ($info[1] - $height);
			break;
			default:
				return false;
			break;
		}
	}
	$new_image = imagecreatetruecolor($width, $height);
	imagecopyresampled($new_image, $this->image, 0, 0, $x, $y, $width, $height, $width, $height);
	$this->image = $new_image;
	return true;
}
public function save($loc, $compression=100)
{
	$backtrace = debug_backtrace();
	if(empty($this->image)) return die('<b>Fatal error:</b> Invalid call to Image()->save, no image is set on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	$func = 'image' . $this->ext;
	return $func($this->image, $loc, $compression);
}
public function output()
{
	$backtrace = debug_backtrace();
	if(empty($this->image)) return die('<b>Fatal error:</b> Invalid call to Image()->output, no image is set on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	header('Content-type: image/' . $this->ext);
	$func = 'image' . $this->ext;
	$func($this->image);
}
}

 

It just reflects the changes and fixes the problem(s) that igance pointed out.

[anatak]

I changed the original to include a resize function that keeps the aspect ratio.

Maybe it was already possible with your code but I will gladly admit that I am not as good a programmer as you are and I did not fully understand your code.

 

Here is what I use

I will use the updated version.

<?php
class Image
{
var $image, $ext, $file;
public function __construct($im=NULL)
{
	define('CENTER', 0, true);
	define('CENTER_LEFT', 1, true);
	define('CENTER_RIGHT', 2, true);
	define('TOP_CENTER', 3, true);
	define('TOP_LEFT', 4, true);
	define('TOP_RIGHT', 5, true);
	define('BOTTOM_CENTER', 6, true);
	define('BOTTOM_LEFT', 7, true);
	define('BOTTOM_RIGHT', 8, true);

	if(empty($im)) return true;
	$info = @getimagesize($im);
	$backtrace = debug_backtrace();
	if(!$info)
		return die('<b>Fatal error:</b> \'' . $im . '\' is not a valid image resource on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	$ex = explode('/', $info['mime']);
	$this->ext = $ex[1];
	$func = 'imagecreatefrom' . $this->ext;
	$this->image = @$func($im);
	$this->file = $im;
	return true;
}
public function setImage($im)
{
	$info = @getimagesize($this->file);
	$backtrace = debug_backtrace();
	if(!$info)
		return die('<b>Fatal error:</b> \'' . $im . '\' is not a valid image resource on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	$ex = explode('/', $info['mime']);
	$this->ext = $ex[1];
	$func = 'imagecreatefrom' . $this->ext;
	$this->image = @$func($im);
	$this->file = $im;
	return true;
}
public function aspect_resize($max_width, $max_height)
{
	$backtrace = debug_backtrace();
	if(empty($this->image)) return die('<b>Fatal error:</b> Invalid call to Image()->resize, no image is set on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	//get the width and height of the image
	$info = Array(imagesx($this->image), imagesy($this->image));
	//check if image width height is greater than max_width max_height
	if($info[0]>$max_width OR $info[1]>$max_height){
		//check wich value is greater, width or height
		if($info[0]>$info[1]){
			//landscape: width is greater than height
			//get the aspect ratio of the picture (greatest value divided by smallest value)
			$aspect=$info[0]/$info[1];
			//image resize if width is greatest value new_width=$desire_width, new_height = desire_width/aspect ratio
			$new_width = $max_width;
			$new_height = $max_width/$aspect;
		}else{
			//portrait or square
			//get the aspect ratio of the picture (greatest value divided by smallest value)
			$aspect=$info[1]/$info[0];
			//image resize if height is greatest value new_height=$desire_heigth, new_width = desire_heightth/aspect ratio
			$new_height = $max_height;
			$new_widt = $max_height/$aspect;
		}
		$new_image = imagecreatetruecolor($new_width, $new_height);
		imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $new_width, $new_height, $info[0], $info[1]);
		$this->image = $new_image;
		return true;
	}
}

public function resize($width, $height, $porportional=FALSE, $percent=NULL, $max=NULL)
{
	$backtrace = debug_backtrace();
	if(empty($this->image)) return die('<b>Fatal error:</b> Invalid call to Image()->resize, no image is set on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	$info = Array(imagesx($this->image), imagesy($this->image));
	if($porportional)
	{
		if(empty($max) && empty($percent)) return false;
		if(empty($max))
		{
			$new_width = $info[0] * ($percent/100);
			$new_height = $info[1] * ($percent/100);
		}
		else
		{
			if($info[0] < $max && $info[1] < $max) return false;
			$new_width = ($info[0] > $info[1]) ? $max : ($info[0]/$info[1]) * $max;
			$new_height = ($info[0] > $info[1]) ? ($info[1]/$info[0]) * $max : $max;
		}
	}
	else
	{
		$new_width = $width;
		$new_height = $height;
	}
	$new_image = imagecreatetruecolor($new_width, $new_height);
	imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $new_width, $new_height, $info[0], $info[1]);
	$this->image = $new_image;
	return true;
}

public function crop($width, $height, $x, $y, $position=NULL)
{
	$backtrace = debug_backtrace();
	if(empty($this->image)) return die('<b>Fatal error:</b> Invalid call to Image()->crop, no image is set on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	$info = Array(imagesx($this->image), imagesy($this->image));
	if($width > $info[0] || $height > $info[1]) return false;
	if(!empty($position) && $position >= 0 && $position <= 
	{
		switch($position)
		{
			case CENTER:
				$x = ($info[0] - $width)/2;
				$y = ($info[1] - $height)/2;
			break;
			case CENTER_LEFT:
				$x = 0;
				$y = ($info[1] - $height)/2;
			break;
			case CENTER_RIGHT:
				$x = ($info[0] - $height);
				$y = ($info[1] - $height)/2;
			break;
			case TOP_CENTER:
				$x = ($info[0] - $width)/2;
				$y = 0;
			break;
			case TOP_LEFT:
				$x = 0;
				$y = 0;
			break;
			case TOP_RIGHT:
				$x = ($info[0] - $width);
				$y = 0;
			break;
			case BOTTOM_CENTER:
				$x = ($info[0] - $width)/2;
				$y = ($info[1] - $height);
			break;
			case BOTTOM_LEFT:
				$x = 0;
				$y = ($info[1] - $height);
			break;
			case BOTTOM_RIGHT:
				$x = ($info[0] - $width);
				$y = ($info[1] - $height);
			break;
			default:
				return false;
			break;
		}
	}
	$new_image = imagecreatetruecolor($width, $height);
	imagecopyresampled($new_image, $this->image, 0, 0, $x, $y, $width, $height, $width, $height);
	$this->image = $new_image;
	return true;
}
public function save($loc, $compression=0)
{
	$backtrace = debug_backtrace();
	if(empty($this->image)) return die('<b>Fatal error:</b> Invalid call to Image()->save, no image is set on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	$func = 'image' . $this->ext;
	return $func($this->image, $loc, $compression);
}
public function output()
{
	$backtrace = debug_backtrace();
	if(empty($this->image)) return die('<b>Fatal error:</b> Invalid call to Image()->output, no image is set on <b>line ' . $backtrace[0]['line'] . ' [' . $backtrace[0]['file'] . ']</b>');
	header('Content-type: image/' . $this->ext);
	$func = 'image' . $this->ext;
	$func($this->image);
}
}
?>

 

I just added

public function aspect_resize($max_width, $max_height)

[ignace]

Alex you can't return anything in your constructor.

 

	if(empty($im)) return true;

 

Doesn't work.