How do you get from photo to canvas?

[Mike McCarty]

I can see benefit to this cross hair method.

Also, I can see that your method could give you a true "distance," but, how does it give you direction?

It's true I have to take two measurements for each point but this gives me both distance and direction to a specific point. Triangulation, I think it would be called.

[Kimberly Dow]

I only have one thing to add to this discussion:

Beware of WalMart yardsticks. I measured with one for a couple of paintings and could not figure out why they seemed a bit off. I ended up making adjustments free-hand. Turns out the yardstick was off almost a quarter inch.

I try to always draw free-hand first. Then I figure in my head how much I enlarged the photo and make measurements with a little pink ruler my daughter gave me. High-tech I am not.