Resize images

have a look here

http://www.sitepoint.com/article/image-resizing-php

http://www.phpclasses.org/browse/package/1450.html

You may be interested in a short tutorial I wrote on this a while ago:  http://www.nicholassolutions.com/tutorials/php/index.php#cropresize

If you have a significant number of images to resize, then external tools like Cerious Software ThumbsPlus may be of use. Nice app which can create all the mono thumbnails for you. Even contact sheets too if your images warrant that sort of thing.

http://www.cerious.com/

The logic is usually somthing like this.

1. Upload the image into the "tmp" directive.
2. Create a thump from that directive and either save it to file or database blob.
3. Create a (altered size) image from the original to fit into the site.

step three is to ensure that the image size doesnt "mess up" you template if any. So we parse the image twice. 1 to create a thump and 2 to create the image we like as result for some template.

lets say the max sizes of the thump will be 150x150 and the "larger" version should be somthing like 700x700max.

This is how we do it :D

// Function to calculate the image size //
function calc_dim($old_x, $old_y, $new_x, $new_y){
        if($old_x > $old_y){
            $t_new_x = $new_x;
            $t_new_y = $old_y * ($new_y / $old_x);
        }
        if($old_x < $old_y){
            $t_new_x = $old_x * ($new_x / $old_y);
            $t_new_y = $new_y;
        }
        if($old_x == $old_y){
            $t_new_x = $new_x;
            $t_new_y = $new_y;
        }
        $size = array ('width' => $t_new_x, 'height' => $t_new_y);
        return($size);  
    }

function create_image($source, $new_x, $new_y, $type, $location, $name){
         
        // Create a source pointer
            switch($type){
                case "image/jpeg" :
                    $pointer = ImageCreateFromJpeg($source);
                    $trigger = "1";
                    break;
                case "image/pjpeg" :
                    $pointer = ImageCreateFromJpeg($source);
                    $trigger = "1";
                    break;
                case "image/png" :
                    $pointer = ImageCreateFromPng($source);
                    $trigger = "1";
                    break;
                case "image/xpng" :
                    $pointer = ImageCreateFromPng($source);
                    $trigger = "1";
                    break;
                case "image/gif" :
                    $pointer = imagecreatefromgif($source);
                    $trigger = "2";
                    break;    
            }else{
                echo "type not allowed";
            }
         
        if($trigger = "1"){
            $old_x = imageSX($pointer);
            $old_y = imageSY($pointer);
         
            // Compute size //
            $size = $this->calc_dim($old_x, $old_y, $new_x, $new_y);
             
            if($thump_canvas = ImageCreateTrueColor($size['width'], $size['height'])){
                if(ImageCopyResampled($thump_canvas, $pointer, 0, 0, 0, 0, $size['width'], $size['height'], $old_x, $old_y)){
                    Imagejpeg($thump_canvas, $location.$name.'.jpg', 100);
                    Imagedestroy($thump_canvas);
                    return(true);
                }else{
                    return(false);
                }
            }else{
                return(false);
            }
        }else{    
            $old_x = imageSX($pointer);
            $old_y = imageSY($pointer);
            $size = compute_thump_size($old_x, $old_y, $new_x, $new_y);
         
            if($thump_canvas =imagecreatetruecolor($size['width'], $size['height'])){
                $clr['red']=255;
                  $clr['green']=255;
                  $clr['blue']=255;
                  if($pallet =imagecolorallocate($thump_canvas, $clr['red'],$clr['green'],$clr['blue'])){
                  imagefill($thump_canvas,0,0,$pallet);
                      if(ImageCopyResampled($thump_canvas, $pointer, 0, 0, 0, 0, $size['width'], $size['height'], $old_x, $old_y)){
                            Imagejpeg($thump_canvas, $location.$name.'.jpg', 100);
                            Imagedestroy($thump_canvas);
                            return(true);
                    }else{
                        return(false);
                    }
                  }else{
                      return(false);
                  }
            }else{
                return(false);
            }
        }    
    }

// You are using the upload directives so we dont actually need to "move" the file anymore and worry about rights etc, We just create 2 new ones like this //

if(is_uploaded_file($_FILES['tmp_name']) ){
       $path = './images/uploads/original/';
       $thpath= './images/uploads/thumps/';
      // Thump //
       $width = "150"; $height="150";
      create_image($_FILES['userfile']['tmp_name'], $width, $height, $_FILES[userfile]['type'], basename($_FILES['userfile']['name']), $thpath);
     //Image
         $width = "700"; $height="700";
      create_image($_FILES['userfile']['tmp_name'], $width, $height, $_FILES[userfile]['type'], basename($_FILES['userfile']['name']), $path);
}else{
    //no uploaded file
}

Good Luck!

Do I have to install the GD graphic library in order to manage do the resizing?

yes...although if you use third party software as RQuadling suggested, perhaps not...

First of all thank you all for your response, however  I feel a little confused.

Can I adjust my code with a code that will resize and put in two diffeent folders the images?
Also how I can install the GD graphic?The php is not installed in my computer, as I connect with FTP with an exernal company that host
php and mysql.

 dutchclan  I used your code but it didn't run

So please more help?

Thank you,
Xenia
 

The GD library exists so I can use the GD library. However, the code of dutchclan is not working

I cannot do the resizing, so I would appreciate if somebody could help me adjusting the existing code I have written
to make also resize and store to two different folders.

Thank you in advance,
Xenia

Please any suggestions?

Thanks

form page
<form enctype="multipart/form-data" action="upload.php" method="post">
<input type="file" name="uploadfile"/>
<input type="submit"/>
-------------------------------------------------------

upload.php page
--------------------
<?php
echo  $_POST['txt'];
$uploadedfile = $_FILES['uploadfile']['tmp_name'];
$src = imagecreatefromjpeg($uploadedfile);
list($width,$height)=getimagesize($uploadedfile);
$newwidth=600;
$newheight=($height/$width)*600;
$tmp=imagecreatetruecolor($newwidth,$newheight);
imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);
$filename = "images/". $_FILES['uploadfile']['name'];
imagejpeg($tmp,$filename,100);

imagedestroy($src);
imagedestroy($tmp);
?>


this script requires a folder called images in the same location as the script and has to have write permission on it
this script will work on jpg files. it uses GD lib (ofcourse)

inform me of updates

Hi dr_debo ,

I tryied your code but is not working ,any suggestions?

Thanks,
Xenia

Xenia

try to install php and mysql on your local computer for development, and after that upload your work to the production server. it is not recommended at all that you mess around with a production server!
my code works with me just fine, create a php file with phpinfo(); and in the resulted page search for GD part, after all, gd might not be installed in the first place. also, what is your PHP version ??

The version of php is PHP Version 4.3.10 and the informaiton for GD are the following:

GD Support       enabled
GD Version       bundled (2.0.28 compatible)
FreeType Support       enabled
FreeType Linkage       with freetype
GIF Read Support       enabled
GIF Create Support       enabled
JPG Support       enabled
PNG Support       enabled
WBMP Support       enabled
XBM Support       enabled

The inital code I wrote that uploads images in the server is working and is strange how the new code cannot work.It says that the image was uploaded but I cannot see teh image.

Thanks

not working, like not seeing a result or spitting out errors ??
are u sure that the file upload folder has write permissions ??

It has the right permissions but still doesn't work.
When I upload the image doesn't give me any errors

something is totally screwed here, this code is pretty simple, i tried it on my production server, which uses php.4.3
something is just wrong. maybe your ISP has uploads disabled or something, or you didn't set permission well !!!!

The strange thing is that when I used my code which is just upload images with the following code it did the upload:

//Check for an product image
if (is_uploaded_file($_FILES['image_small']["tmp_name"]))
      {            
        if (move_uploaded_file($_FILES['image_small']["tmp_name"], "../../images/small_images/". $_FILES['image_small']["name"]))
                                                {
                                                      echo " The image for product has been uploaded! ";
                                                      
                                                      
                                                      
                                                }else {
                                                                  echo "The image for product could not be uploaded";
                                                                  $image='';
                                                }
                                    $image=$_FILES['image_small']["name"];
                                    //echo "image: ". $image;
                                    
                                    
                                    } else {
                                                 $image='';
                                                 }

So I guest if the ISP has uploads displayed or I hadn't gave the correct permisions it shouldn't work neither my code,what you recommend?

Thanks

u upload to this folder
"../../images/small_images"
did u adjust that folder in the code i sent u ??

ok, lets try my code with just the upload part, shall we ?
upload.php page
--------------------
<?php
echo (move_uploaded_file($_FILES['uploadfile']['tmp_name'],"images/". $_FILES['uploadfile']['name']))? "upload complete":"Upload failed";
?>

First of all thank you for your time that you help me, Ok it was uploaded to the server however it was not resized to smaller.

I put in the line of code:
$filename = "../images/small_images/". $_FILES['uploadfile']['name'];

instead of :

$filename = "images/". $_FILES['uploadfile']['name'];

<?php
echo  $_POST['txt'];
$uploadedfile = $_FILES['uploadfile']['tmp_name'];
$src = imagecreatefromjpeg($uploadedfile);
list($width,$height)=getimagesize($uploadedfile);
$newwidth=600;
$newheight=($height/$width)*600;
$tmp=imagecreatetruecolor($newwidth,$newheight);
imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);
$filename = "../images/small_images/". $_FILES['uploadfile']['name'];
imagejpeg($tmp,$filename,100);

imagedestroy($src);
imagedestroy($tmp);
?>


Where do you think might be the problem

Thank you
Xenia

please note that my code change file size to 600 X ???

upload a jpg file, that is, say 1200X1000 or something
or reduce 600 to a smaller value, say 250 and test the results

What I notice is that even though I have gave permision to the specific folder and its files
whenever I upload to the specific location it turns the specific image with no privileges

yes i change the dimension to 50

<?php
echo  $_POST['txt'];
$uploadedfile = $_FILES['uploadfile']['tmp_name'];
$src = imagecreatefromjpeg($uploadedfile);
list($width,$height)=getimagesize($uploadedfile);

$newwidth=50;  //<------ here

$newheight=($height/$width)*50; //<----- and here

$tmp=imagecreatetruecolor($newwidth,$newheight);
imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);
$filename = "../images/small_images/". $_FILES['uploadfile']['name'];
imagejpeg($tmp,$filename,100);

imagedestroy($src);
imagedestroy($tmp);
?>

Ok, I just copy and paste what you write but again it doesn't resize it.

I have the following problems:
The first one is that when I succesfully upload an image to the server in the specific folder(which has full privileges)it changes the privilege
to 666 and cannot display the page when I go to the specific url in the browser.

However,when I am going to the server and change again the privileges of the image,it displays the normal size and not the smaller image.
when I go to the absolute url.

try it on my own site
http://www.alatebaa.com/im/

the very very same script, on ur very own PHP version !!!

if it is not folder permission, then it is something magic or from March :)

Yes you are right I test in your site and is working.

Ok so the directory you are putting in the following code:

$filename = "../images/small_images/". $_FILES['uploadfile']['name'];

is which?

I think also that the problem is with the permissions,however the weard is that I change the privileges but somehow it changes again.

i upload to a folder at the same level of my script
images/

try creating  a new folder

just a question, how do u change permissions of the folder ??

I tryied to change the path in order to store the image general in the website outside from the images folder and is working.
I have an Ftp software called Ipswitch WS_FTP professional and I change from this program.
I had change again with the same program the permission and it was ok.Is there any alterenative way to change them?

I would like to ask you a last question.I want to store in a differnet folder the large images with specific dimensions and in differnet folder
the small images with also specific dimensions.How I can do it regarding your code?

Thank you again,
Xenia

just add this line before processing the image

$uploadedfile = $_FILES['uploadfile']['tmp_name'];
copy($_FILES['uploadfile']['tmp_name'],"images/large_". $_FILES['uploadfile']['name']);

here, the uploaded image will be saved as such with a prefix "large_"

It changes again the right , I can't understand why. I change also the previleges from Dreamweaver also but the same.
What else you think to try in order to change the permissions?

ALso regarding to the follwing code it doesn't resize it now,can you have it a look?

$uploadedfile = $_FILES['uploadfile']['tmp_name'];
copy($_FILES['uploadfile']['tmp_name'],"../large_". $_FILES['uploadfile']['name']);

echo  $_POST['txt'];
$uploadedfile = $_FILES['uploadfile']['tmp_name'];

//copy($_FILES['uploadfile']['tmp_name'],"../large_". $_FILES['uploadfile']['name']);

$src = imagecreatefromjpeg($uploadedfile);
list($width,$height)=getimagesize($uploadedfile);

echo (move_uploaded_file($_FILES['uploadfile']['tmp_name'],"../". $_FILES['uploadfile']['name']))? "upload complete":"Upload failed";

echo "file name ". $_FILES['uploadfile']['name'];

echo "filename ". $filename;


?>

<img src="../<? echo $_FILES['uploadfile']['name']; ?>">

Thanks

Now it is working great apart from the permission, some tims are ok some others are change,anyway I will put them just as it is in the directory.


Thank you very much for your help and your time,

Xenia

welcome, glad it finally worked for u

hi dr_debo,

I have a problem with a problem with the images an dI would like to ask you something?
Some images does not upload them.

try the simple code for testing uploads
<?php
echo (move_uploaded_file($_FILES['uploadfile']['tmp_name'],"images/". $_FILES['uploadfile']['name']))? "upload complete":"Upload failed";
?>

what I want to ask you is till how much has to be the size of the photo in order to resize it?

Because if I have dimention 400*400 or similar it displays only black image

if it dislays balck, it means it is not a jpg file. if you have warnning on, you'd see a lot of warnning and division by zero errors and so

No nothing

Sorry, it displas that upload was failed.  the image is jpeg but the size is something like 1944x2592.
In the code that you wrote it has restriction about the size of the image?

jpeg is not jpg !

also check maximum file upload size in php.ini, the default is 2 MB

jpeg is as jpg ,i check it all in photoshop,all the other images where in jpeg and it upload them.
I didn't find the maximum upload size.

What else you suggest?

Thanks