Where is this photo from? (Angela Lansbury LOVETT)

Looks like a SWEENEY TODD production photo, probably published in more than one publication I'm guessing. If you're looking for specifically where that image was scanned from, maybe you could email the webmaster of that "Murder She Wrote" fan site and ask where they got it.
Email link is on the main page:
http://jesmaine.tripod.com/index.definitiveMSW.html
(Scroll to the bottom of the page.)

I have a full page photo very similiar, it was from After Dark. I liked it so much I ended up framing it, and still have it to this day.

Isn't it wonderful! LIFE used to run one remarkable photo on the last page of each issue. The feature was called "Just One More." This terrific, in-character photo appeared in the May, 1979 issue ($1.50!). I was a SWEENEY TODD fanatic and saved the issue. It looks like a studio photo and is credited to Barbara Bordnick. The caption reads: "She's done Hamlet's mother, made Mame memorable, and now the incredibly versatile Angela Lansbury gives her finest performance as daft Mrs. Lovett, who cooks meat pies out of human victims in the startling Hal Prince-Stephen Sondheim musical SWEENEY TODD."