Expected output without -n argument

If the program is run without the -n argument “the full application is run”.
Am I correct in my understanding that this is equivalent to running the program with n = width of image? This in turn should then carve out the entire image leaving a black image the same dimensions as the input image?
I’m asking because currently my program leaves 1 column of pixels remaining and I want to be sure this is a bug.

Yes, after running without giving -n, your image should be black.

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