The image above was inserted into PowerPoint.
Below, it has been divided into 10 equal segments.
Measure image width at each interval. Divide each width by image length (width/length),
Let us say you want a 70-inch board. Multiply 70 inches by the width/length for each interval. That will be your width for every 7-inch interval.
[However, if you want a specific maximum width for a given length, you will have to play with (proportionally adjust) the width/length ratios:
Bluegrass Board Building: Making a Surfboard Template from a Photo or Image ]
A framing square, a piece of masonite…
Accept. Reject. It does not affect me.
