resizing image

notaloser

here is a form that displays the current dimensions of an image in 2 text boxes. then the user can change the image size and submit it, but i get an error:

Warning: imagecopyresampled(): supplied argument is not a valid Image resource in /home/muralsb/public_html/admin/resizepics.php on line 76

line 76 and 77 are:

imagecopyresampled('$image_new', '$filename', '0', '0', '0', '0', '$newwidth', '$newheight', '$imgsize[0]', '$imgsize[1]')
or die(mysql_error());

anyone know?

$imgsize = getimagesize("http://muralsbyjane.com/uploads/".$getfilename);

if($_POST['changesize']) {

$filename = "http://n3graphics.com/notaloser/caha/uploads/".$getfilename;
$newwidth = $_POST['pwidth'];
$newheight = $_POST['pheight'];
$image_new = imagecreatetruecolor($newwidth, $newheight);

header("Content: image/jpeg");

imagecopyresampled('$image_new', '$filename', '0', '0', '0', '0', '$newwidth', '$newheight', '$imgsize[0]', '$imgsize[1]')
or die(mysql_error());

echo "Dimensions altered";

}else{

echo "<Br><Br>If you are happy with the dimensions of this image, click <a href='menu.php.'>here</a>";

echo "<form name='resize' method='post'>";
echo "<table width='500' cellpadding='2' cellspacing='2'>";

echo "<tr><td width='30%'>Width:</td>";
echo "<td width='70%'><input type='text' name='pwidth' size='10' value='".$imgsize[0]."'/></td></tr>";

echo "<tr><td width='30%'>Height:</td>";
echo "<td width='70%'><input type='text' name='pheight' size='10' value='".$imgsize[1]."'/></td></tr>";

echo "<tr><td width='30%'>&nbsp;</td>";
echo "<td width='70%'><input type='submit' name='changesize' size='10' value='Save Changes'/></td></tr>";

echo "</table></form>";


	}

Installer

See here for the correct usage of quote marks, and here for the correct argument types for "imagecopyresampled()". In short, remove all the quote marks from all the arguments.

brandtj

First: Variables should not be included in single quotes.
Second: An image pointer needs to be setup for the second image.

I am going to assume your image is a jpeg image, but if it's not, it's simple enough to change.

$new_width = $_POST['width'];
$new_height = $_POST['height'];

$filename = 'http://n3graphics.com/notaloser/caha/uploads/' . $getfilename;
$original = imagecreatefromjpeg ($filename);
$orig_size = getimagesize ($filename);

$new = imagecreatetruecolor ($orig_size[0], $orig_size[1]);

imagecopyresampled ($new, $original, 0, 0, 0, 0, $new_width, $new_height, $orig_size[0], $orig_size[1]);

header ('Content-type: image/jpeg');
imagejpeg ($new);