Optoma GT720

Peak Brightness (9.91)

The Optoma GT720 can create a very, very bright white. It’s unrelated to the short throw, because the values below are in lumens, which measures raw brightness and ignores throw distance as a factor. Clearly, the mode you choose has a huge factor on the brightness. Bright mode is brightest (big surprise). Cinema mode is the dimmest, but we highly recommend it for movies and gaming, because it’s the only mode that offers decent color performance.

Peak Brightness

The Optoma GT720 has a great peak brightness compared to other projectors. It trumped the three similar projectors that we pulled in for comparison.

Peak Brightness

Tunnel Contrast (1.08)

The Optoma GT720 has a hard time maintaining a consistent black level as the amount of black area on the screen decreases. This is the same kind of problem that we see frequently in plasma TVs. Look at the chart below. The right side represents the black level when 90% of the screen is a black rectangle. The left side is just 5% black, surrounded by 95% bright white. The black level has brightened by several-fold.

Tunnel Contrast

Uniformity (9.00)

The Optoma GT720 definitely showed some problems with screen uniformity. You can see in the chart below that when we measured the screen brightness at 9 points, there’s significant unevenness. The center and top are so much brighter than the bottom and sides.

Uniformity

Greyscale Gamma (9.01)

The Optoma GT720 does a good job of transitioning from black to white, which is called the greyscale gamma. Look at the chart below. The shadows are the left side and the highlights are the right side. The line is smooth as it transitions up and to the right. There’s no instance of kinks or areas of flatness that might indicate a lack of detail. Also, consider the slope of the line. An ideal slope is somewhere between 2.1. and 2.2. The Optoma GT720’s performance of 2.26 is very nearly on the money, and earned it a good score.

Greyscale Gamma

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