Add image sizes

Heres how to add few image sizes to WordPress.

This is really basic but here you go. Put this in your themes functions.php file.

if ( function_exists( 'add_image_size' ) ) {
  //Non cropped tall thumb with 3:4 ratio
  add_image_size( 'tall_thumbnail', 80, 107 );
  //Small 30x30 cropped thumb
  add_image_size( 'tiny_thumbnail', 30, 30, true );
}