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I created a custom field that allows me to set the cropping style of timthumb, but I am also using short code to populate a page with blog posts, but the shortcode isn't picking up the customfield, so all the images look different.

Here is the code from index.php

<a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>">
  <img src="<?php bloginfo('template_directory'); ?>/timthumb.php?src=<?php echo $thumb; ?>&h=150&w=600&zc=1&q=100&a=<?php echo get_post_meta($post->ID, 'thumbcrop', true); ?>" 
       alt="<?php the_title(); ?>" />

Here is the code from blog.php (shortcode)

<a href="'.get_permalink().'" title="'.get_the_title().'">
  <img src="'. get_bloginfo('template_directory').'/timthumb.php?src='.$thumb.'&h=100&w=600&zc=1&q=100" 
       alt="'.get_the_title().'" />

The shortcode file hasn't been updated, as I'm not sure how to pass the customfield value.

Can anyone help out. Much appreciated.

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I don't understand your questions. In the first codesample, you add a GET parameter a with the shortcode's vaule to the image URL. You don't do so in the second. So why are you surprised you get a differeny effect? Note that you can use get_the_ID() instead of $post->ID. The former definitely works during shortcode evaluation. – Raphael Jan 21 '12 at 11:46

could be a question of string concatenation - try (untested):

<a href="'.get_permalink().'" title="'.get_the_title().'"><img src="'. get_bloginfo('template_directory').'/timthumb.php?src='.$thumb.'&h=100&w=600&zc=1&q=100&a='.get_post_meta($post->ID, 'thumbcrop', true).'" alt="'.get_the_title().'" /></a>
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