I want to be able to send an email that contains a link to one of my gallery photographs. However I want the viewer to see only the large version of that photograph and not either the others or any collection/group page?
On the page (the Big Picture Version URL you are referencing), right-click on the image itself and look at the Properties. The properties will give the direct reference to the .JPG or .TIF, etc., file that the Big Picture Page embeds.
Ian, Some email clients, like Microsoft Outlook, may cut a link in two lines, inserting this character > for line break. that renders the link useless for "just clicking" So you must ask your recipient(s) to copy/paste the link into their browser window, without that > character.