Backs - OptrixAU/printathome-python GitHub Wiki
Some card games don't really need backs (_Agent Decker is a good example, as it's a game you can easily play with a one-sided print).
However, some cards do.
The tool looks for card backs in three places...
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If there are any files that use the same name, with [back] at the end. For example, when printing SkipTurn.png, it will check for SkipTurn[back].png
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If there is a file called back.png or back.jpg in the folder
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If 1 and 2 fail, by re-using the image used on the front.
And there are several different ways of printing card backs.
See Decide if and how you are printing backs for some details.