Image Convilution....

[rajeevthomas]

Hi everyone... I am a beginner. For a gallery I have, I am trying to upload thumbnails and sharpen them using image convolution. I am not sure I am doing the right thing or not. I am not getting arrors but I do not see any sharpening effect!!  So I know I am dead wrong some where...! Please help me with this....

 

I am also not st sure I have the right source for $img...

 

This is where I need some help...

 

[color=red]           $img = ImageCreateTrueColor ( $thumbnail_width, $thumbnail_height);

           $sharpenMatrix = array
            (
                array(-1.2, -1, -1.2),
                array(-1, 20, -1),
                array(-1.2, -1, -1.2)
            );

            // calculate the sharpen divisor
            $divisor = array_sum(array_map('array_sum', $sharpenMatrix));           

            $offset = 0;
           
            // apply the matrix
            imageconvolution($img, $sharpenMatrix, $divisor, $offset); [/color]

 

 

 

This is my code for the upload file....

 

 

    include("config.inc.php");
    if(!$_POST) {
    header("Location: preupload.php");
    exit();
} 


    // initialization
    $result_final = "";
    $counter = 0;

// List of our known photo types
    $known_photo_types = array(
                        'image/pjpeg' => 'jpg',
                        'image/jpeg' => 'jpg',
                        'image/gif' => 'gif',
                        'image/bmp' => 'bmp',
                        'image/x-png' => 'png'
                    );
   
// GD Function List
    $gd_function_suffix = array(
                        'image/pjpeg' => 'JPEG',
                        'image/jpeg' => 'JPEG',
                        'image/gif' => 'GIF',
                        'image/bmp' => 'WBMP',
                        'image/x-png' => 'PNG'
                    );

// Fetch the photo array sent by preupload.php
    $photos_uploaded = $_FILES['photo_filename'];
    
// Fetch the photo caption array
    $photo_caption = $_POST['photo_caption'];

// Fetch the photo caption array
    $photo_description = $_POST['photo_description'];

// Fetch the photo caption array
    $photo_keyword = $_POST['photo_keyword'];

    while( $counter <count($_FILES['photo_filename']['tmp_name']) ) 
{
        if($photos_uploaded['size'][$counter] > 0)
        {
            if(!array_key_exists($photos_uploaded['type'][$counter], $known_photo_types))
            {
                $result_final .= "File ".($counter+1)." is not a photo<br />";
            }
            else
            {
                mysql_query(
                    "INSERT INTO
                        gallery_photos (
                    `photo_filename`,
                    `photo_caption`,
                    `photo_description`,
                    `photo_keywords`,
                    `photo_category`
                    ) VALUES(
                        '0',
                        '".addslashes($photo_caption[$counter])."',
                        '".addslashes($photo_description[$counter])."',
                        '".addslashes($photo_keyword[$counter])."',
                        '".addslashes($_POST['category'])."')"
                    ) or die(mysql_error() . 'Photo not uploaded');
                   
                $new_id = mysql_insert_id();
                $filetype = $photos_uploaded['type'][$counter];
                $extention = $known_photo_types[$filetype];
                $filename = $new_id.".".$extention;

                mysql_query( "UPDATE gallery_photos SET photo_filename='".addslashes($filename)."' WHERE photo_id='".addslashes($new_id)."'" );

                // Store the orignal file
                copy($photos_uploaded['tmp_name'][$counter], $images_dir."/".$filename);

                // Let's get the Thumbnail size
                $size = GetImageSize( $images_dir."/".$filename );
                if($size[0] > $size[1])
                {
                    $thumbnail_width = 500;
                    $thumbnail_height = (int)(500 * $size[1] / $size[0]);
                }
                else
                {
                    $thumbnail_width = (int)(500 * $size[0] / $size[1]);
                    $thumbnail_height = 500;
                }
           
                // Build Thumbnail with GD 1.x.x, you can use the other described methods too
                $function_suffix = $gd_function_suffix[$filetype];
                $function_to_read = "ImageCreateFrom".$function_suffix;
                $function_to_write = "Image".$function_suffix;

                // Read the source file
                $source_handle = $function_to_read ( $images_dir."/".$filename );
               
                if($source_handle)
                {
                    // Let's create an blank image for the thumbnail
                        $destination_handle = ImageCreateTrueColor ( $thumbnail_width, $thumbnail_height );
               
                    // Now we resize it
                    imagecopyresampled( $destination_handle, $source_handle, 0, 0, 0, 0, $thumbnail_width, $thumbnail_height, $size[0], $size[1] ) ;
                }

            
[color=red]           $img = ImageCreateTrueColor ( $thumbnail_width, $thumbnail_height);

           $sharpenMatrix = array
            (
                array(-1.2, -1, -1.2),
                array(-1, 20, -1),
                array(-1.2, -1, -1.2)
            );

            // calculate the sharpen divisor
            $divisor = array_sum(array_map('array_sum', $sharpenMatrix));           

            $offset = 0;
           
            // apply the matrix
            imageconvolution($img, $sharpenMatrix, $divisor, $offset); [/color]

           
                // Let's save the thumbnail
                $function_to_write( $destination_handle, $images_dir."/tb_".$filename, 100 );
                ImageDestroy($destination_handle );
                //

           
               

                $result_final .= "<img src='".$images_dir. "/tb_".$filename."' /> File ".($counter+1)." Added<br />";
            }
        }
    $counter++;
    }

    // Print Result
echo <<<__HTML_END

<html>
<head>
    <title>Photos uploaded</title>
</head>
<body>
    $result_final
</body>
</html>

__HTML_END;