Chadcoleman created wonderful tutorials, how to added Custom Size Post Thumbnail. All we need to do only put some functions and use it whatever and whenever you want.
Added this code on your functions.php
if ( function_exists( 'add_theme_support' ) ) { // Added in 2.9
add_theme_support( 'post-thumbnails' );
set_post_thumbnail_size( 50, 50, true ); // Normal post thumbnails
add_image_size( 'my-custom-size', 405, 180, true );
}
That it’s, you have new custom size for you thumbnail and you can call it with Post Thumbnail Tricks



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Cool! I wanted to add a news section on my site, and I need custom sized thumbs for that.
I’ll see to give this one a go if I do not find a plug-in.
Thanks!