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 );
}