Hi Fred,

Nothing specific, but canvas shrinkage depends on a number of factors. Humidity, age, coating, material e.g. cotton/polyester or both, final varnishing, handling in printer - feed, vacuum, roll weight, if you repackage the roll after printing, how tightly the manufacturer spooled it, etc. Not everything can be resolved by following someone else's formula, you have to test it out for yourself. In a humid environment, I would expect on first opening the canvas roll packaging, then the dampness would cause the outer layers to expand more than the inner, the outer layer tension will tend to relax, too. Also, the printer feed mechanism has to work harder dragging the canvas off the full roll, so the start of the roll would also be pre-stretched by the print mechanism, maybe. Polyester has less stretching problems, generally, but not such a defined texture as cotton. On the intermittant printing that I do, I never get the canvas print the exact size, but it doesn't bother me since I measure the final print, allow for my final stretching over the frame, and I make the frame to suit. If you want to work to the nearest 1/16th of an inch, then you most likely need to make a full size test print, and then adjust the final image size to suit. Nothing wrong with pre-cutting the roll, and feeding in single sheets.

Best wishes,

Ray