I recently downloaded the BIZZ theme from WP Explorer: http://www.wpexplorer.com/bizz-wordpress-theme/ and have been creating a modified site design via my local MAMP server. However on amending the single page portfolio image to be full width 920px by 403px (the image displayed in the image area is all pixelated and appears to the category thumbnail) I've not changed or edited the standard PHP code in the theme apart from enlarging the div area display and the image I've uploaded in wordpress is a 72dpi jpg 920 by 403px (I've even inserted the image into a blog post and it looks perfect quality to check it hadn't corrupted on upload)
the code in the single page is:
<?php //get full-sized image $full_img = wp_get_attachment_image_src(get_post_thumbnail_id(), 'full-size'); ?> <a>" class="prettyphoto-link" title="<?php the_title(); ?>"><?php the_post_thumbnail('portfolio-single'); ?></a>
any help would be gratefully appreciated - I've been trying to search on google and wordpress for answers, but had no luck.