The form of digital art which manipulates real scenarios/scenes in a fashion which maintains that realism.
The digital transformation of the real subject need not be physically plausible, as long as that realism is maintained.
For example, transforming a real building into a robot would be considered realuterism as long as there were enough real looking steps in the transformation from real building to digital robot.
A simple morphing of the above building into a robot would not be enough to constitute computealism.
Also see computealism
For example digitally destroying a real building by means of digital explosion or collapse would be realuterism
transforming a tongue into a person, provided there is enough visual evidence to support a supposed scientific understanding of the transformation.