Checking for key facial features, such as the curl of the mouth, brow furrow and the openness of the eyes, the program can work out the apparent emotional state of the viewer.
Researcher Dr John Collomosse, from the Computer Science Department at the University of Bath, said the team looked at image psychology to ascertain how the variations should correspond to emotional states.
He said: "There are a lot of artworks that haven't made it through to end users because they are fiddly to control - there are a lot of parameters that need to be set.
"I think it is a really exciting area - digital photography has really taken off, and there is a market emerging for tools to manage and manipulate digital photos."
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