by Octillion » 17 Jul 2006 12:17
Good templates will have a measure of scale somewhere on them. Print the template full sized, and measure the scale with a ruler. From this, you can determine how much you need to reduce/enlarge the picture while printing to get it to actual size.
The ratio to print will be the size of the scale in the picture divided by the actual size of the scale when printed at 100%. For example, if you measure that 10cm on a ruler in the picture measures 17.3cm on paper, the image will need to be scaled 10/17.3, or reduced to about 58%.