Erro No Upload

[Flávio_rj]

Olá pessoal, alguém sabe como eu envio uma foto através do upload para o código abaixo? eu estou utilizando a forma abaixo mas parece que não está reconhecendo a imagem?!

Warning: imagecopyresampled(): supplied argument is not a valid Image resource in /home/meusite/www/redimensionar.php on line 78

<?php

$filein = $_FILES['filein']['tmp_name'];

$fileout = 'pasta/foto_redimensionada.jpg'; 

$imagethumbsize_w = 100; // thumbnail size (area cropped in middle of image)
$imagethumbsize_h = 75; // thumbnail size (area cropped in middle of image)
resize_then_crop( $filein,$fileout,$imagethumbsize_w,
$imagethumbsize_h,/*rgb*/"255","255","255");


function resize_then_crop( $filein,$fileout,
$imagethumbsize_w,$imagethumbsize_h,$red,$green,$blue)
{

// Get new dimensions
list($width, $height) = getimagesize($filein);
$new_width = $width * $percent;
$new_height = $height * $percent;

   if(preg_match("/.jpg/i", "$filein"))
   {
	   $format = 'image/jpeg';
   }
   if (preg_match("/.gif/i", "$filein"))
   {
	   $format = 'image/gif';
   }
   if(preg_match("/.png/i", "$filein"))
   {
	   $format = 'image/png';
   }

	   switch($format)
	   {
		   case 'image/jpeg':
		   $image = imagecreatefromjpeg($filein);
		   break;
		   case 'image/gif';
		   $image = imagecreatefromgif($filein);
		   break;
		   case 'image/png':
		   $image = imagecreatefrompng($filein);
		   break;
	   }

$width = $imagethumbsize_w;
$height = $imagethumbsize_h;
list($width_orig, $height_orig) = getimagesize($filein);

if ($width_orig < $height_orig) {
  $height = ($imagethumbsize_w / $width_orig) * $height_orig;
} else {
	$width = ($imagethumbsize_h / $height_orig) * $width_orig;
}

if ($width < $imagethumbsize_w)
//if the width is smaller than supplied thumbnail size 
{
$width = $imagethumbsize_w;
$height = ($imagethumbsize_w/ $width_orig) * $height_orig;;
}

if ($height < $imagethumbsize_h)
//if the height is smaller than supplied thumbnail size 
{
$height = $imagethumbsize_h;
$width = ($imagethumbsize_h / $height_orig) * $width_orig;
}

$thumb = imagecreatetruecolor($width , $height);  
$bgcolor = imagecolorallocate($thumb, $red, $green, $blue);   
ImageFilledRectangle($thumb, 0, 0, $width, $height, $bgcolor);
imagealphablending($thumb, true);

imagecopyresampled($thumb, $image, 0, 0, 0, 0,
$width, $height, $width_orig, $height_orig);
$thumb2 = imagecreatetruecolor($imagethumbsize_w , $imagethumbsize_h);
// true color for best quality
$bgcolor = imagecolorallocate($thumb2, $red, $green, $blue);   
ImageFilledRectangle($thumb2, 0, 0,
$imagethumbsize_w , $imagethumbsize_h , $white);
imagealphablending($thumb2, true);

$w1 =($width/2) - ($imagethumbsize_w/2);
$h1 = ($height/2) - ($imagethumbsize_h/2);

imagecopyresampled($thumb2, $thumb, 0,0, $w1, $h1,
$imagethumbsize_w , $imagethumbsize_h ,$imagethumbsize_w, $imagethumbsize_h);

// Output
//header('Content-type: image/gif');
//imagegif($thumb); //output to browser first image when testing

if ($fileout !="")imagegif($thumb2, $fileout); //write to file
header('Content-type: image/gif');
imagegif($thumb2); //output to browser
}
?>[/codebox]

Editado Julho 13, 2007 por Beraldo
Adição das tags code