NOTE: Every mode except Photo has similar grayscale balance, with green low and blue high throughout the IRE range.
The biggest issue with the HD25-LV is that no mode can be adjusted without turning into User mode. Furthermore, there is no way to save any adjustments you make. If, for example, you’re in Cinema mode and you accidentally bring up one of the adjustment parameters (like Brightness or Contrast), anything you’ve done in User mode is wiped out and replaced by Cinema mode setting.
Regarding the grayscale: Optoma usually has full grayscale calibration abilities in their projectors. Not so with the HD25-LV. Instead of having Gain and Offset RGB controls to cover both ends of the IRE range, there is a single trio of RGB controls (that act full range) under “White” in the “Color Settings” portion of the menu. This can work if the RGB values are consistent throughout the range to begin with, but with the HD25-LV, they’re not. Nonetheless, I was able to get a decent grayscale balance with an average Delta E of 1.8.