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Top row: hand-drawn portraits; Bottom row: computer-generated versions.

The Wall Street Journal has developed an artificial-intelligence system for creating its distinctive 'hedcut' portraits.

Human-created hedcut of Grumpy Cat, 2013, courtesy Wall Street Journal

Hedcuts have a wood-engraving or scratchboard look, made up of dots and dashes.

Left: human-created 'hedcut' of actress Chloë Grace Moretz
Right: AI-created hedcut, courtesy Wall Street Journal

The AI learned the style and produced adequate results in most cases. But there were difficulties. One challenge was "teaching the tool to render hair and clothes differently than skin, which was often a matter of whether to crosshatch versus stipple."

Error cases caused by AI working with too limited set of data,
courtesy Wall Street Journal

"The most harrowing issue of all was overfitting, which happens when a model fits a limited set of data too closely. In this case, that meant the machine became too satisfied with its artistic ability and began producing terrifying monstrosities like these."

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Read more on Wall Street Journal: What’s in a Hedcut? Depends How It’s Made.