GD library: imagecopyresampled() creating black images...

[dumbass]

Hey all,

I'm trying to use the GD library to create thumbnails of images being uploaded...I can get the script to work BUT, the thumbnails turn out all black...

Here's the code:

    private function createthumb($name,$filename,$new_w,$new_h)
    {
        $system=explode(".",$name);
        if (preg_match("/jpg|jpeg/",$system[1])){$src_img=imagecreatefromjpeg($name);}
        if (preg_match("/png/",$system[1])){$src_img=imagecreatefrompng($name);}
        $old_x=imageSX($src_img);
        $old_y=imageSY($src_img);
        if ($old_x > $old_y) 
        {
            $thumb_w=$new_w;
            $thumb_h=$old_y*($new_h/$old_x);
        }
        if ($old_x < $old_y) 
        {
            $thumb_w=$old_x*($new_w/$old_y);
            $thumb_h=$new_h;
        }
        if ($old_x == $old_y) 
        {
            $thumb_w=$new_w;
            $thumb_h=$new_h;
        }
        $dst_img=ImageCreateTrueColor($thumb_w,$thumb_h);

        imagecopyresampled($dst_img,$src_img,0,0,0,0,$thumb_w,$thumb_h,$old_x,$old_y); 
        if (preg_match("/png/",$system[1]))
        {
            imagepng($dst_img,$filename); 
        } else {
            imagejpeg($dst_img,$filename); 
        }

        imagedestroy($dst_img); 
        imagedestroy($src_img); 
    }

My server is running GD version: bundled (2.0.34 compatible). Anyone had this problemo? Thanks!

[dumbass]

So further testing this script, it seems to be some sort of permissions problem or relative path deal, but I can't get around this:

When I run a test script from directly within the root directory the function works correctly: using the gd library it correctly writes the appropriate thumbnail image without errors. Testing from the root directory, I'm using the relative paths like so:

// create thumbnail
    $imagePath = 'images/banners/abstract_blue.jpg';
    $thumbPath = 'images/banners/thumbs/thm_abstract_blue.jpg';

createthumb($imagePath, $thumbPath , 50, 50);
chmod($thumbPath, 0755);

..and so on...

When I run the same script in a directory below the root directory (which is where I need to run it from), relative path or not, I get errors, either the thumbnail images come out all black, or no thumbnail images is created.

I can't figure this out...any ideas?

[dumbass]

Right, so in my original post, the lines below checked the system file path to get the type of image file:

$system=explode(".",$name);
if (preg_match("/jpg|jpeg/",$system[1])){$src_img=imagecreatefromjpeg($name);}
 

...but because the full path had a '.com' in it (just the way the provider handles it, not my choice), it broke the code...I rewrote this to get around the issue by using:

 
$info = getImageSize($fileFullPath);
 

then using the third element of the array returned, which gives you the image type, like so:

 
    switch ($info[2]) {
        case IMAGETYPE_GIF:
            $infunc = 'ImageCreateFromGif';
            $outfunc = 'ImageGif';
            break;

    case IMAGETYPE_JPEG:
        $infunc = 'ImageCreateFromJpeg';
        $outfunc = 'ImageJpeg';
        break;

    case IMAGETYPE_PNG:
        $infunc = 'ImageCreateFromPng';
        $outfunc = 'ImagePng';
        break;

    default;
        throw new Exception('Invalid image type');
}
 

and got it to work, anyone interested can let me know...