Photoshop tutorial showing how to create an authentic, OP ART digital painting based on the masterworks of Victor Vasarely.

Computer-made art, on the other hand, has always sort of looked like it was made by a machine, or at least something without emotions or a shaky hand.

As computer technology improved, he was then able to use retouching techniques in Photoshop to enhance, manipulate or draw out the painterly aspects of the image.

A computer-generated portrait created in the style of 17th century Dutch master Rembrandt van Rijn was unveiled this week, with its makers saying that they based the new piece on extensive digital ...