If I remember right you have to unset
all the defaults and add the new Size
there:
<?php
function mxdCustomImageSizes($sizes) {
unset( $sizes['thumbnail']);
unset( $sizes['medium']);
unset( $sizes['large']);
unset( $sizes['full'] );
$myimgsizes = array(
'full-size' => __( 'Full Size' )
);
if( !empty($sizes) )
return array_merge($sizes, $myimgsizes);
else
return $myimgsizes;
}
add_filter('intermediate_image_sizes_advanced', 'mxdCustomImageSizes');
And then add the full-size
size which is 99999x99999
right below which size is almost unbelievable so is full size.
add_image_size( 'full-size', 99999, 99999, false );
Please correct me if something goes wrong
P. S. You'll need a plugin to "save as" all your images according to your new settings. I can recommend the Regenerate Thumbnails plugin.
P. P. S. When it's the single Option any way you'll have to choose one of one :). There no straight way to make one Size selected in the new (3.5.1) Media window.
0
and keep WP from generating those sizes. If this doesn't work, please report back. If it works, then there's some plugin or theme interfering.