Minimum image size for uploading

Question

I need a way restrict authors from uploading a images bellow specific dimensions. Say I only want to allow uploading images that are at least 400px x 400px. If the image is smaller, the author should get a error notice that the image is too small. Is there a plugin or code that can accomplish this? Thanks in advance.

Answer 1

Add this code to your theme's functions.php file, and it will limit minimum image dimentions

add_filter('wp_handle_upload_prefilter','tc_handle_upload_prefilter');
function tc_handle_upload_prefilter($file)
{

    $img=getimagesize($file['tmp_name']);
    $minimum = array('width' => '640', 'height' => '480');
    $width= $img[0];
    $height =$img[1];

    if ($width < $minimum['width'] )
        return array("error"=>"Image dimensions are too small. Minimum width is {$minimum['width']}px. Uploaded image width is $width px");

    elseif ($height <  $minimum['height'])
        return array("error"=>"Image dimensions are too small. Minimum height is {$minimum['height']}px. Uploaded image height is $height px");
    else
        return $file; 
}

Then just change the numbers of the minimum dimensions you want (in my example is 640 and 480)