Setting thumbnail featured image size not working properly

Question

Hi I just started today on creating my first Wordpress Theme and I am trying to create a featured Image for each post.Aldo I have managed to acomplish that it seems that the sizes I am giving it are not taking effect.Here is my code:

if(function_exists('add_theme_support')){
   add_theme_support('post-thumbnails' , array('post'));
   set_post_thumbnail_size(200,120);
}

if(function_exists('has_post_thumbnail') && has_post_thumbnail()){
      the_post_thumbnail();
}

It seems that my featured images are not always set to the same size.For example if the image is smaller then what size I set it will remain the same , for big images the width is the same but for some the height is different.

What am I doing wrong here?

Answer 1

It's default behaviour that the images aren't scaled up. Easiest way would be to use simple CSS to scale it up.

How to scale up featured post thumbnail?

For the second part set the crop parameter of set_post_thumbnail_size to true.

set_post_thumbnail_size( 200, 120, true );

http://codex.wordpress.org/Function_Reference/set_post_thumbnail_size