cropping an image, removing any white space surrounding image prior to uploading

[blackbox]

Hi all,

I am trying to write a script that removes/crops any white space from around an iamge prior up the image been uploaded to the server.

I have a user form which allows the selection of an image from a local drive. The form gets submitted and my upload script runs.

The error I am getting is,
Warning: imagecreatefrompng(Untitled-5.png) [function.imagecreatefrompng]: failed to open stream: No such file or directory in /home/xxxxx/public_html//new_upload.php on line 275

I am I using the "$_FILES['image_field']['name']" correctly.

The user form:

<form action="new_upload.php" target="_self" method="post" enctype="multipart/form-data" name="new" id="new">
<input type="image" src="../../../nav/images/save_button.png" class="submit" value="upload"/>
<input type="file" name="image_field" id="image_field" class="imaindatesel"/>
</form.

In the upload script I have:

$img = imagecreatefrompng($_FILES['image_field']['name']);


//find the size of the borders
$b_top = 0;
$b_btm = 0;
$b_lft = 0;
$b_rt = 0;

//top
for(; $b_top < imagesy($img); ++$b_top) {
  for($x = 0; $x < imagesx($img); ++$x) {
    if(imagecolorat($img, $x, $b_top) != 0xFFFFFF) {
       break 2; //out of the 'top' loop
    }
  }
}

//bottom
for(; $b_btm < imagesy($img); ++$b_btm) {
  for($x = 0; $x < imagesx($img); ++$x) {
    if(imagecolorat($img, $x, imagesy($img) - $b_btm-1) != 0xFFFFFF) {
       break 2; //out of the 'bottom' loop
    }
  }
}

//left
for(; $b_lft < imagesx($img); ++$b_lft) {
  for($y = 0; $y < imagesy($img); ++$y) {
    if(imagecolorat($img, $b_lft, $y) != 0xFFFFFF) {
       break 2; //out of the 'left' loop
    }
  }
}

//right
for(; $b_rt < imagesx($img); ++$b_rt) {
  for($y = 0; $y < imagesy($img); ++$y) {
    if(imagecolorat($img, imagesx($img) - $b_rt-1, $y) != 0xFFFFFF) {
       break 2; //out of the 'right' loop
    }
  }
}

//copy the contents, excluding the border
$newimg = imagecreatetruecolor(
    imagesx($img)-($b_lft+$b_rt), imagesy($img)-($b_top+$b_btm));

imagecopy($newimg, $img, 0, 0, $b_lft, $b_top, imagesx($newimg), imagesy($newimg));

//finally, output the image
header("Content-Type: image/jpeg");
imagejpeg($newimg);

echo imagejpeg;

[Derokorian]

You are not using it correctly. That is the filename as uploaded by the user. What you want, is the tmp_name entry, which is where PHP has stored the file upload, temporarily so that your script can work with it.

[blackbox]

Hi Derokorian,

Many thanks for your reply, [I have made that change which has removed the error.

One last question. I am using "class.upload.php" to perform the actual upload but I am struggering on how to use result of the function "imagejpeg($newimg);"

I have tried both, below, but both fail.

$handle = new upload($_FILES['image_field']);

and

$handle = new upload($newimg);

include ("class.upload.php");

$handle = new upload($_FILES['image_field']);
$handle->image_resize         = true;
$handle->image_ratio_y        = true;
$handle->image_x              = 60;
$handle->image_convert 		  = 'png';
$handle->image_background_color = '#FFFFFF';
$handle->file_overwrite = true;
$handle->process('/home/xxx/public_html/image/');