The invention is a seamless projection lithography system that eliminates the need for masks through the use of a programmable Spatial Light Modulator (SLM) with high parallel processing power. Illuminating the SLM with a radiation source (
), which while preferably a pulsed laser may be a shuttered lamp or multiple lasers with alternating synchronization, provides a patterning image of many pixels via a projection system (
) onto a substrate (
). The preferred SLM is a Deformable Micromirror Device (
) for reflective pixel selection using a synchronized pulse laser. An alternative SLM is a Liquid Crystal Light Valve (LCLV) (
) for pass-through pixel selection. Electronic programming enables pixel selection control for error correction of faulty pixel elements. Pixel selection control also provides for negative and positive imaging and for complementary overlapping polygon development for seamless uniform dosage. The invention provides seamless scanning by complementary overlapping scans to equalize radiation dosage, to expose a pattern on a large area substrate (
). The invention is suitable for rapid prototyping, flexible manufacturing, and even mask making.