Resize and Crop images

[exhaler]

Hi,

i'm currently using this script to resize and crop images but it doesn't work proportionally, also how can i keep the transparency.

function ResizeProportionalImage($nw, $nh, $source, $stype, $dest="")
{
	$size = getimagesize($source);
	$w = $size[0];
	$h = $size[1];

	switch ($stype) {
		case IMAGETYPE_GIF:
		$simg = imagecreatefromgif($source);
		break;

		case IMAGETYPE_JPEG:
		$simg = imagecreatefromjpeg($source);
		break;

		case IMAGETYPE_PNG:
		$simg = imagecreatefrompng($source);
		break;
	}

	$dimg = imagecreatetruecolor($nw, $nh);

	$wm = $w/$nw;
	$hm = $h/$nh;

	$h_height = $nh/2;
	$w_height = $nw/2;

	if($w > $h) {
		/*$adjusted_width = $w / $hm;
		$half_width = $adjusted_width / 2;
		$int_width = $half_width - $w_height;

		imagecopyresampled($dimg,$simg,-$int_width,0,0,0,$adjusted_width,$nh,$w,$h);*/
		imagecopyresampled($dimg,$simg,0,0,0,0,$nw,$nh,$w,$h);
	}
	else if(($w < $h) || ($w == $h)) {
		$adjusted_height = $h / $wm;
		$half_height = $adjusted_height / 2;
		$int_height = $half_height - $h_height;

		imagecopyresampled($dimg,$simg,0,-$int_height,0,0,$nw,$adjusted_height,$w,$h);
	} else {
		imagecopyresampled($dimg,$simg,0,0,0,0,$nw,$nh,$w,$h);
	}
	if($dest != "")
		imagejpeg($dimg,$dest,100);
	else
		return $dimg;
}

 

if someone has a better way of resizing and cropping image proportionally please post it

thanks

[Deoctor]

try using this one

<?php
resize("./", "http://images.wsdot.wa.gov/nwflow/flowmaps/sysvert.gif", "538", "./");
function resize($cur_dir, $cur_file, $newwidth, $output_dir)
{
    $dir_name = $cur_dir;
    $olddir = getcwd();
    $dir = opendir($dir_name);
    $filename = $cur_file;
    $format='image/gif';
    if(preg_match("/.jpg/i", "$filename"))
    {
        $format = 'image/jpeg';
    }
    if (preg_match("/.gif/i", "$filename"))
    {
        $format = 'image/gif';
    }
    if(preg_match("/.png/i", "$filename"))
    {
        $format = 'image/png';
    }
    if($format!='')
    {
        list($width, $height) = getimagesize($filename);
        $newheight=$height*$newwidth/$width;
        switch($format)
        {
            case 'image/jpeg':
            $source = imagecreatefromjpeg($filename);
            break;
            case 'image/gif';
            $source = imagecreatefromgif($filename);
            break;
            case 'image/png':
            $source = imagecreatefrompng($filename);
            break;
        }
        $dimg = imagecreatetruecolor(640,538);
        imagealphablending($dimg, false);
        $source = @imagecreatefromgif("$filename");
        imagecopyresized($dimg, $source, 0,0,0,438, $newwidth, $newheight, $width, $height);
        $filename="$output_dir/test1.gif";
        @imagegif($dimg,$filename);
    }
}
?>

[exhaler]

thx ym_chaitu, but its not resizing proportionally and handling transparency

[Deoctor]

for proportional resizing u need to use an external application like image magick or some thing..

 

http://php.net/manual/en/book.imagick.php

[jl5501]

I would suggest you look at phpthumb

 

http://phpthumb.sourceforge.net/

[Deoctor]

u can even check this script

 

http://www.nashruddin.com/Resize_Image_to_Different_Aspect_Ratio_on_the_fly

 

or else try with this script

<?php
header ("Content-type: image/jpeg");
/*
JPEG / PNG Image Resizer
Parameters (passed via URL):

img = path / url of jpeg or png image file

percent = if this is defined, image is resized by it's
          value in percent (i.e. 50 to divide by 50 percent)

w = image width

h = image height

constrain = if this is parameter is passed and w and h are set
            to a size value then the size of the resulting image
            is constrained by whichever dimension is smaller

Requires the PHP GD Extension

Outputs the resulting image in JPEG Format

By: Michael John G. Lopez - www.sydel.net
Filename : imgsize.php

Modified by: Nash - http://nashruddin.com
Added:
- displays default image if the requested image doesn't exist
- hide image path from user
*/

$path = '/path/to/your/images';                      // change to where your images reside
$img  = $path . '/' . $_GET['img'];

if (file_exists($img)) {
    $percent = $_GET['percent'];
    $constrain = $_GET['constrain'];
    $w = $_GET['w'];
    $h = $_GET['h'];
} else {
    $img = $path . '/default.jpg';    // change with your default image
    $percent = 100;
}

// get image size of img
$x = @getimagesize($img);
// image width
$sw = $x[0];
// image height
$sh = $x[1];

if ($percent > 0) {
    // calculate resized height and width if percent is defined
    $percent = $percent * 0.01;
    $w = $sw * $percent;
    $h = $sh * $percent;
} else {
    if (isset ($w) AND !isset ($h)) {
        // autocompute height if only width is set
        $h = (100 / ($sw / $w)) * .01;
        $h = @round ($sh * $h);
    } elseif (isset ($h) AND !isset ($w)) {
        // autocompute width if only height is set
        $w = (100 / ($sh / $h)) * .01;
        $w = @round ($sw * $w);
    } elseif (isset ($h) AND isset ($w) AND isset ($constrain)) {
        // get the smaller resulting image dimension if both height
        // and width are set and $constrain is also set
        $hx = (100 / ($sw / $w)) * .01;
        $hx = @round ($sh * $hx);

        $wx = (100 / ($sh / $h)) * .01;
        $wx = @round ($sw * $wx);

        if ($hx < $h) {
            $h = (100 / ($sw / $w)) * .01;
            $h = @round ($sh * $h);
        } else {
            $w = (100 / ($sh / $h)) * .01;
            $w = @round ($sw * $w);
        }
    }
}

$im = @ImageCreateFromJPEG ($img) or // Read JPEG Image
$im = @ImageCreateFromPNG ($img) or // or PNG Image
$im = @ImageCreateFromGIF ($img) or // or GIF Image
$im = false; // If image is not JPEG, PNG, or GIF

if (!$im) {
    // We get errors from PHP's ImageCreate functions...
    // So let's echo back the contents of the actual image.
    readfile ($img);
} else {
    // Create the resized image destination
    $thumb = @ImageCreateTrueColor ($w, $h);
    // Copy from image source, resize it, and paste to image destination
    @ImageCopyResampled ($thumb, $im, 0, 0, 0, 0, $w, $h, $sw, $sh);
    
    // Output resized image
    @ImageJPEG ($thumb);
}
?>