I can think of a couple of options:
-
Create a new shortcode, e.g. my_gallery. You can copy the code in
wp-includes/media.php
. Look for the code staring with
add_shortcode('gallery', 'gallery_shortcode');
and then the actual
function. Rename / modify as needed. The actual img link is within
the$link
variable -
Use something like this (untested), which should work but might
strip-out all width/height from any link.
_
add_filter('wp_get_attachment_link', 'remove_img_width_height', 10, 1);
function remove_img_width_height($html) {
$html = preg_replace( '/(width|height)=\"\d*\"\s/', "", $html );
return $html;
}