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How can I accurately scale up an A4 drawing onto a much bigger canvas, without a projector? Answered

I have a few line drawings I want to reproduce but on a much larger scale, but without the whole route of clear plastic + overhead projector (no such tools available). Any ideas?!


OR...you could do it for practically free.  If you have a printer, paper, and ink for the printer try this.


^^site's great....use it a lot.


9 years ago

I use a proportional divider set to precisely the ratio needed. It has to be one which can be varied smoothly and not limited to step changes. Mine came by online purchase from www.blackmouse.com and cost only £25.00 in sterling

get the following: 1 sheet of A4 tracing paper (if it's got squares on- even better one pencil- a Hb type or harder. ruler (long) adhesive tape if the tracing paper hasent got squares on- then draw a grid on it- makes each square 10mm by 10mm. now holding the pencil lightly (so you get really pale lines)- draw the same grid on the bigger canvas- but remenber to make each square bigger (like 20mm by 20mm) than whats on the tracing paper. use the tape to hold the tracing paper in place- make a copy of the origional drawing. finally- one square at a time- re-draw the traced image onto the respective square on the bigger grid. this is why you need light pencil lines for the grid- so you cant see them after your done. (this is a really good technique for doing murals on your bedroom wall!!)

There's an art projector that's usually pretty cheap called Tracer or Tracer Jr. http://www.artograph.com/projectors.htm

I mention it because it's very build-able. It relies on a mirror, a lamp, and a movable lens. If you go to any good art-supply store, you'll find one. Go there, take a good look at it and then buy it or go home and build one. There won't be any need for a transparencies, you just set it on top of your art and point it at whatever you want to transfer it onto.

Another technique is to scan or photograph your drawings and enlarge them digitally. You can then print them off in pieces (if they're bigger than the paper your printer accepts) or have them printed in large-formats at a copy shop. Either way is pretty cheap and you can combine the idea with other techniques.

Or, take a digital photograph and project it onto a wall with a digital projector. Enlarge the projection to the desired size and trace it onto paper.

Or the classic solution: Overlay it with translucent tracing paper, lay out a grid on the other surface, fill in each large box freehand using the small box as a guide. Tedious, but works reasonably well even if you aren't much of an artist.