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I am trying my hands with WP add_image_size method and this is the entry in my theme's function.php

if ( function_exists( 'add_theme_support' ) ) {
 add_theme_support( 'post-thumbnails' );
 set_post_thumbnail_size( 100, 65); // default Post Thumbnail dimensions   

if ( function_exists( 'add_image_size' ) ) { 
 add_image_size( 'home_page_featured', 200, 225, true);

I tried with both parameters of crop factor but seems nothing is working for me. I am uploading Dimensions 628x355 and want that beside all OOB image size, home_page_featured should be get created with dimensions 200x225, but WP is generating it as 200x113

i tried with Regenerate Thumbnails plugin but seems like it is not working, not sure where i am doing wrong.

share|improve this question
add_image_size('home_page_featured',200,225,true); works ok for me, WP 3.5 and TwentyTwelve: uploading a 628x355 image generates a 200x225 thumbnail. Check if debugging outputs information and do a full troubleshooting. – brasofilo Jan 13 '13 at 13:33
@brasofilo: this is some weired behaviour for me, will check log info – Umesh Awasthi Jan 13 '13 at 14:31

The code bellow should work properly. Also read this post WordPress Featured Images – add_image_size() resizing and cropping demo.

Add this code in the file functions.php:
add_image_size( 'Home Page Featured'', 200, 225, true );

And call it like this in home page the_post_thumbnail('Home Page Featured');

share|improve this answer
but you have to reupload images otherwise try { wordpress.org/extend/plugins/ajax-thumbnail-rebuild - This plugin allows you to re-build the post thumbnails. Useful if you use add_image_size() after already having uploaded post thumbnails. (This plugin is slow, but never has out of memory errors). } – Furqan Jan 13 '13 at 9:47

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