A Quasi-Center-Weighted PWM exposure scheme (with stretched bit) was created for a Multi-level LED printhead that reduces the exposure time difference between available exposure levels; thereby enabling better non-uniformity correction at very high printing speed. Also this technology still maintains the advantages of centered line with sharper text/graphics and the lower current spike (not all the pixels are turned on or turned off at the same time) of the regular Center-Weighted PWM system at the same time. Working together with a non-linear exposure non-uniformity correction method that obtains non-uniformity correction and gray level simultaneously, this system is shown to produce uniformity of ∼ 0.5% throughout the dynamic range of exposure of the multi-level printing system at high speed.