VASSAL TUTORIALS - Map Making, page 2

Now it's time to add the scans of the actual map that you've already made - if not, scan the map now. I scan section by section, making sure that each scan overlaps a bit. I prefer to scan at 300 dpi, which makes the scans large, but not overwhelming for my computer.  Adjust as needed to fit your needs.  DO NOT RESIZE the scans!  We'll do that shortly.  They all need to be the same size, so scan using the entire width/height of your scanner.

How do I resize my scans so that they match the hexgrid that I made?

This isn't a scientific method, but it works for me.  First, I make a selection of a hex from my hexgrid.png file as demonstrated below:

I copy that selection and apply it to a new file.  All we're wanting here is to get the width of that selection.  In this example, let's say that it is 78 pixels wide.

Now, we want to do the same with any one of your scans of the actual map, again as demonstrated below:

Get the width of that selection as well. Let's say for this example, that they are 115 pixels in width. Now, some simple math to decide what percent of a reduction is needed for each of your map scans:

78 divided by 115 = .6782608, or rounded to .68.

So, we can now resize each map scan individually or using a batch:

If our original scans were 1838 pixels in width each, you would multiply that by our percentage of .68 to get 1249.84 or rounded to 1250 pixels.  Resize as in the screenshot above.

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