Original caption by Diana Gabaldon: "I saw a few people wondering how Colum's deformed legs were done, and suggesting that it must be CGI. It is, of course. I learned while on set that in order to introduce a particular CGI image, you do the filming with a unique pattern occupying the spot where you intend that image to go. The CGI software can then detect that image and substitute the one you want.
So Gary Lewis wore these odd-looking Mondrian-patterned knee socks for the filming, and the crippled legs were then CGI-ed in during the post-production. This is a shot of me and Gary comparing socks, as mine just happened to be a miniature of his. <g>" (Source)
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Colum MacKenzie is Jamie's maternal uncle. He is a man who reigns over a powerful clan, but must...