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Set the default Featured Image (formerly Post Thumbnail) dimensions. To register additional image sizes for Featured Images use: add_image_size().
Note: To enable featured images, the current theme must include add_theme_support( 'post-thumbnails' ); in its functions.php file. See also Post Thumbnails.
<?php set_post_thumbnail_size( $width, $height, $crop ); ?>
To be used in the current theme's functions.php file.
add_theme_support( 'post-thumbnails' ); set_post_thumbnail_size( 150, 150 );
This function will not resize your existing featured images. To regenerate existing images in the new size, use the Regenerate Thumbnails plugin.
Set the default Post Thumbnail size by resizing the image proportionally (that is, without distorting it):
set_post_thumbnail_size( 50, 50 ); // 50 pixels wide by 50 pixels tall, resize mode
Set the default Post Thumbnail size by cropping the image (either from the sides, or from the top and bottom):
set_post_thumbnail_size( 50, 50, true ); // 50 pixels wide by 50 pixels tall, crop mode
Set the default Post Thumbnail size by cropping the image from top left:
set_post_thumbnail_size( 50, 50, array( 'left', 'top') ); // 50 pixels wide by 50 pixels tall, crop from the top left corner
Set the default Post Thumbnail size by cropping the image from the center:
set_post_thumbnail_size( 50, 50, array( 'center', 'center') ); // 50 pixels wide by 50 pixels tall, crop from the center
set_post_thumbnail_size() is located in wp-includes/media.php.