Image resize PHP

Question

I'm still a newbie regarding image handling or file handling for that matter in PHP.

Would appreciate any input regarding the following

I post an image file using a simple html form and upload it via php. When i try and alter my code to accomodate larger files (i.e. resize) I get an error. Have been searching online but cant find anything really simple.

$size = getimagesize($_FILES['image']['tmp_name']);

                    //compare the size with the maxim size we defined and print error if bigger
                    if ($size == FALSE)
                    {
                        $errors=1;
                    }else if($size[0] > 300){   //if width greater than 300px
                        $aspectRatio = 300 / $size[0];
                        $newWidth = round($aspectRatio * $size[0]);
                        $newHeight = round($aspectRatio * $size[1]);
                        $imgHolder = imagecreatetruecolor($newWidth,$newHeight);
                    }

    $newname= ROOTPATH.LOCALDIR."/images/".$image_name; //image_name is generated

    $copy = imagecopyresized($imgHolder, $_FILES['image']['tmp_name'], 0, 0, 0, 0,            $newWidth, $newHeight, $size[0], $size[1]);
move_uploaded_file($copy, $newname); //where I want to move the file to the location of $newname

The error I get is:

imagecopyresized(): supplied argument is not a valid Image resource in

Thanks in advance

---

Thanks for all your input, i've changed it to this

$oldImage = imagecreatefromstring(file_get_contents($_FILES['image']['tmp_name']));
                $copy = imagecopyresized($imgHolder, $oldImage, 0, 0, 0, 0, $newWidth, $newHeight, $size[0], $size[1]);
                if(!move_uploaded_file($copy, $newname)){
                    $errors=1;
                }

Not getting a PHP log error but its not saving :(

Any ideas?

Thanks again

---

Result

Following works.

$oldImage = imagecreatefromjpeg($img);
                        $imageHolder = imagecreatetruecolor($newWidth, $newHeight);
                        imagecopyresized($imageHolder, $oldImage, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
                        imagejpeg($imageHolder, $newname, 100); break;

Thanks for everyones help

Answer 1

$_FILES['image']['tmp_name'] is path not image resource. You have to use one of imagecreatefrom*() functions to create resource.

Answer 2

imagecopyresized takes an image resource as its second parameter, not a file name. You'll need to load the file first. If you know the file type, you can use imagecreatefromFILETYPE to load it. For example, if it's a JPEG, use imagecreatefromjpeg and pass that the file name - this will return an image resource.

If you don't know the file type, all is not lost. You can read the file in as a string and use imagecreatefromstring (which detects file types automatically) to load it as follows:

$oldImage = imagecreatefromstring(file_get_contents($_FILES['image']['tmp_name']));

Answer 3

I use ImageMagick for stuff like that. Look how much simpler it is!

An example from one of my scripts:

$target= //destination path
move_uploaded_file($_FILES['item']['tmp_name'],$target);

$image = new imagick($target);

$image->setImageColorspace(imagick::COLORSPACE_RGB);
$image->scaleImage(350,0);

$image->writeImage($target);

You could then use getImageGeometry() to obtain the width and height.

For example:

$size=$image->getImageGeometry();
if($size['width'] > 300){   //if width greater than 
   $image->scaleImage(300,0);
}

Also, using scaleImage(300,0) means that ImageMagick automatically calculates the height based on the aspect ratio.

Answer 4

Here is my implementation of saving a thumbnail picture:

Resize and save function:

function SaveThumbnail($imagePath, $saveAs, $max_x, $max_y) 
{
    ini_set("memory_limit","32M");
    $im  = imagecreatefromjpeg ($imagePath);
    $x = imagesx($im);
    $y = imagesy($im);

    if (($max_x/$max_y) < ($x/$y)) 
    {
        $save = imagecreatetruecolor($x/($x/$max_x), $y/($x/$max_x));
    }
    else 
    {
        $save = imagecreatetruecolor($x/($y/$max_y), $y/($y/$max_y));
    }
    imagecopyresized($save, $im, 0, 0, 0, 0, imagesx($save), imagesy($save), $x, $y);

    imagejpeg($save, $saveAs);
    imagedestroy($im);
    imagedestroy($save);
}

Usage:

$thumb_dir = "/path/to/thumbnaildir/"
$thumb_name = "thumb.jpg"
$muf = move_uploaded_file($_FILES['imgfile']['tmp_name'], "/tmp/test.jpg")

if($muf)
{
    SaveThumbnail("/tmp/test.jpg", $thumb_dir . $thumb_name, 128, 128);
}

Answer 5

I was working on sth similar. I tried Ghostscript and ImageMagic. They are good tools but takes a but of time to set up. I ended up using 'sips' on a Snow Leopard server. Not sure if it's built in to Linux server but it's the faster solution I have found if you need sth done quick.