Allow image file paths to contain colons #20
Merged
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Colon characters are allowed in file paths, so if an image file named 'foo:bar.png' is passed as an --image argument, it's currently parsed as image 'bar.png' on output 'foo'.
This fix allows the caller to pass the argument ':foo:bar.png' and treat an output of '' the same as NULL. This is assuming there will never be an output named '' however...