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I have found a map online, I like to print out (see link to original here: http://collections.lib.uwm.edu/digital/collection/agdm/id/4614/).

However, it has an uncommon(?) aspect ratio, which I would like to adjust to a ratio that fits common aspect ratios, like 4:3 or quadratic (or what ever is more suitable for the aspect ratio of the map).

On a Mac, how can I convert the map (with imagemagick?) to jpg or tiff (which ever is more lossless) to have a common aspect ratio without stretching and losing as few as possible from the map.

How can I achieve that?

  • With imagemagick, of course. It runs on Linux. – AlexP May 28 '18 at 8:54
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Of course you can do it with imagemagick which you can install via macports or brew.

In OS X you can do it over Preview application too.

  1. Show Markup Toolbar in Preview application:

enter image description here

  1. Chose Resize image from opened toolbar:

enter image description here

  1. Set necessary size:

enter image description here

Size in my screenshot was taken from Aspect ratio calculator (I'm not sure if it will be useful for you, but it's a good start point of adjusting image procedure for your needs):

enter image description here

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