Make your Photoshop "canvas" the size of your real canvas at as low a dpi as you can go and still expect to get the results you need from your printer. Test by making a couple line drawings and use the minimum where your lines don't give you problems when printed .
When you have settled on your final image divide it into 8x10 inch rectangles. If your printer can put borders on files do a 1 or 2 pixel border on each resulting file to make lining everything up easier. You can also make a border within Photoshop if your printer does not have the ability.
Print and assemble.
This is how I make posters bigger than my printer can print.

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I normally use traditional media for my art work (e.g. paint and canvas etc). I would like to use PS as a mockup tool for some larger than letter size canvas oriented projects. For instance, I can scan or trace an image using my tablet into a PS image that is equivalent to the size of the real life canvas. Then I would like to work on this in PS and then output my work to a printer. The eventual goal would be to use transfer paper to trace the images back to the canvas. I hope you follow that.

The problem is this. Although it is easy to shrink the canvas sized image down so that it all fits on one letter size page, that defeats the purpose of what I want to do. I'd like to be able to print the actual size on mulitple sheets of 8.5 x 11 paper, line/arrange them in the order they need to be to recreate the life size image and then possibly tape them together. The net result would be a output on multiple sheets to recreate the actual image size.

FYI, I can't afford an expensive printer that could handle a poster sized piece of paper, otherwise I wouldn't be trying to use the approach i suggest here.

I can't find anyway to do this.. Is it possible or do I need another piece of software etc.

thanks in advance

bolderado02

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How print Large Canvas Size Image to multiple 8.5x11 sheets of paper??