Thumbnail code creates completly black thumbnails!

[SyncViews]

Why does this create a black image?

<?php
$file_full   = './images/mytrain.jpg';
$file_thumb  = './images/thumbnails/mytrain.jpg';
$file_thumb2 = './images/thumbnails/mytrain.png';

$image_full  = imagecreatefromjpeg ($file_full);
$image_thumb = imagecreatetruecolor(400, 300);

$image_image_x = imagesx($image_full);
$image_image_y = imagesy($image_full);

imagecopyresampled ($image_thumb, $image_full, 0, 0, 0, 0, 400, 300, $file_image_x, $file_image_y);

imagejpeg($image_thumb, $file_thumb, 80);
imagepng($image_thumb, $file_thumb2, 5);
imagedestroy ($image_full);
imagedestroy ($image_thumb);
?>

[papaface]

$file_full   = './images/mytrain.jpg';

Are you trying to access the folders below the current directory?

If so it should be:

$file_full   = '../images/mytrain.jpg';

[SyncViews]

no i'm not but it was playing up without the ./ as well...

 

ive aslso got this on the page so I know the paths are correct...

 

<img src="<?=$file_full?>">

<img src="<?=$file_thumb?>">

<img src="<?=$file_thumb2?>">

 

 

EDIT: also if the path is wrong i get this followed by another 5 or 6 errors

Warning: imagecreatefromjpeg(/images/mytrain.jpg) [function.imagecreatefromjpeg]: failed to open stream: No such file or directory...

[SyncViews]

Still havn't solved this

 

<?php
$file_full   = 'images/mytrain.jpg';
$file_full2  = 'images/mytrain2.png';
$file_thumb  = 'mytrain.jpg';
$file_thumb2 = 'mytrain.png';


$image_full  = imagecreatefromjpeg ($file_full);
$image_thumb = imagecreatetruecolor(400, 300);

$image_image_x = imagesx($image_full);
$image_image_y = imagesy($image_full);
imagecopyresampled ($image_thumb, $image_full, 0, 0, 0, 0, 400, 300, $file_image_x, $file_image_y);

imagejpeg($image_thumb, $file_thumb);
imagepng ($image_thumb, $file_thumb2);
imagepng ($image_full, $file_full2);
imagedestroy ($image_full);
imagedestroy ($image_thumb);
?>
<img src="<?=$file_full?>">
<img src="<?=$file_thumb?>">
<img src="<?=$file_thumb2?>">
<img src="<?=$file_full2?>">

 

The tumbnails just show up black while th other images work...I presume it is that the copy/resise doesn't work but I can't see anytrhing wrong with it

 

Also is there anyway to get a useful error with thse functions? eg eith  the mysql_ functions you can use mysql_error() to get a pretty usful error message if something fails?

[SyncViews]

Does nobody have ansew for this? There must be some basic reason why my code doesn't work...

[paul2463]

i found this function, which iterates over a file and creates thumbnails of all the jpeg images in it

<?php
function createThumbs( $pathToImages, $pathToThumbs, $thumbWidth )
{
SureRemoveDir($pathToThumbs, false);
  // open the directory
  $dir = opendir( $pathToImages );

  // loop through it, looking for any/all JPG files:
  while (false !== ($fname = readdir( $dir ))) {
    // parse path for the extension
    $info = pathinfo($pathToImages . $fname);
    // continue only if this is a JPEG image
    if ( strtolower($info['extension']) == 'jpg' )
    {
           // load image and get image size
      $img = imagecreatefromjpeg( "{$pathToImages}{$fname}" );
      $width = imagesx( $img );
      $height = imagesy( $img );

      // calculate thumbnail size
      $new_width = $thumbWidth;
      $new_height = floor( $height * ( $thumbWidth / $width ) );

      // create a new temporary image
      $tmp_img = imagecreatetruecolor( $new_width, $new_height );

      // copy and resize old image into new image
      imagecopyresized( $tmp_img, $img, 0, 0, 0, 0, $new_width, $new_height, $width, $height );

      // save thumbnail into a file
      imagejpeg( $tmp_img, "{$pathToThumbs}{$fname}" );
    }	
  }
  // close the directory
  closedir( $dir );
}
?>
//called like this
createThumbs( "images/general/", "images/gen_th/", 100 );