Resize a Photo >>

Today we will implement hows to resize photo into a particular width and height (or keeping aspect ratio)

See the live example from: http://www.sajithmr.com/photoshop-tuts/resize/resize.php

You need to install php-gd library to do this. To functions, imagecreatetruecolor and imagecopyresampled will do the resizing.

Those who have not seen the Online Photo Editing tool yet, have a look at: http://www.sajithmr.com/photoshop/index.php 

Here is the function:

function Resize($image,$new_width,$new_height=0)
{

 $old_width = imagesx($image);
 $old_height= imagesy($image);

 if($new_height==0) // if the height is not specified
                           //....calculate the relative height
 $new_height= $new_width * $old_height / $old_width ;

 $new_image= imagecreatetruecolor($new_width, $new_height);
 imagecopyresampled($new_image, $image, 0, 0, 0, 0, $new_width,
 $new_height, $old_width, $old_height);
 return $new_image;

}

Here the $image is the object of the image which is created from the function imagecreatefromgif($path_to_photo), if the image is in GIF format.

Other functions are imagecreatefromjpeg and imagecreatefrompng for JPEG and PNG respectively .

Download Full source code for this example from: http://www.sajithmr.com/photoshop-tuts/resize.zip

In the previous part we implemented browse photos area. http://www.sajithmr.com/online-photoshop-in-php-series-part-2/

In that for browsing picture files, we used full size image, instead of thumbnails. Here new example , in which browse photos is implemented with image thumbnails using resizing (150 px)

The difference is , instead of calling img tag’s src to the orginal image path, called through resize.php?img=path_to_image , passed the image path as parameter to resize function.

See live example: http://www.sajithmr.com/photoshop-tuts/browse-resize/browse.php

Take the html and see the difference from old browse implementation: http://www.sajithmr.com/photoshop-tuts/browse.php

Which is fast ??

Download the full source code for browsing with image thumbnail from: http://www.sajithmr.com/photoshop-tuts/browse-resize.zip

Keep reading for the coming series,  part 4 , Orkut Like Photo Cropping >>

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Regards

Sajith M.R

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This entry was posted on Monday, May 26th, 2008 at 9:00 pm and is filed under php, php source code. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.