Gamma defaults to the normal 2.2 setting. Based on Mike's measurements he's recommending 2.4. I viewed content with both 2.2 and 2.4 settings. With 2.2 setting the W20000 had the best black levels I've seen on any recent projector, including the IN83. I did not find the 2.2 setting to be noticeably off, in any way, but no doubt, the 2.4 setting is a little closer to technical perfection, since it measured out to just over 2.2. Using the setting of 2.2, the average gamma was about 2.05. Bottom line: Not the absolute best color accuracy after calibration, and in a side by side with the IN83, you can see the slight difference, but without a side by side, let's just say that any "error" on the part of the W20000, is notably less than the normal variation in color (based on the director's intent, and the colorist's implementation on the disc), from one movie to the next. In other words, it looked great. Not quite as perfect as it could be, but it should be close enough to please most of the serious enthusiasts.