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OSD Setup & Calibration
The 38UC99 uses a single joystick/button to control everything. Pressing it once gives you access to the power toggle, input selection, and Bluetooth audio. A subsequent right-click brings up the full OSD, which occupies the right portion of the screen. You can also access settings using the included OnScreen Control software.
Quick Settings allows changes to brightness, contrast and audio volume. You can also blank the screen and toggle Bluetooth audio on and off.
The Input sub-menu is more than just a selector. It also contains the aspect ratio control and the PBP function. Ultra-wide monitors are great for displaying multiple sources, and the 38UC99 can handle two signals simultaneously. It also has automatic input sensing, which locks onto the first available source when waking from sleep mode. You can also manage screen real estate using the included Screen Split software.
The Picture menu has everything need for calibration. There are 11 image modes, and Custom is the default. We measured several of them and found they did not stray too far from Rec.709/D65/2.2. Custom is almost spot on out of the box, and we recommend that mode for gaming and all applications. It’s fully-adjustable with a single-point white balance, six-axis color management, and three gamma options. Other modes lock out these controls. Of particular import is the Game Adjust sub-menu. You’ll need to go there to turn on FreeSync for starters. It’s off by default. Or you can try the 1ms Motion Blur Reduction feature. It works just like ULMB on a G-Sync monitor by strobing the backlight between frames. It reduces output but not contrast, which is a first in our experience. It causes visible flickering, though, and we’d rather use FreeSync anyway. Response Time (overdrive) works extremely well in its Fast mode, reducing blur and avoiding any ghosting artifacts.
The Sound menu has a volume slider, which affects both the speakers and the headphone output; and a Bluetooth audio toggle. Yes, the 38UC99 can play audio from your phone or tablet through its better-than-average speakers.
Finally, we have the General menu which contains options like language, energy-saving, power LED, DisplayPort mode, OSD Lock, and Reset. The latter returns all settings to their factory defaults. If you have older devices that don’t play well with HDMI 2.0, there is a compatibility toggle here as well. Quick Charge enables that function from the USB-C connector if you aren’t using it for video.
Our only gripe with the OSD is that is has no signal information. We’d love to know if FreeSync is enabled, for instance, as well as the input resolution and refresh rate. You’ll have to resort to Windows Control Panel and AMD Catalyst for that status. Otherwise, we love the joystick and well-organized menu system and found the 38UC99 a breeze to set up and use.
Calibration
The monitor ships with a calibration data sheet, but it only includes gamma and grayscale information. We wondered if that meant a non-standard color gamut was in use, but our measurements proved it is indeed sRGB with a D65 white point and perfect 2.2 gamma. The 38UC99 doesn’t need to be calibrated, but if you want to squeeze out that last 1%, it’s fairly easy. Stick with the default Gamma 1 setting, turn off the energy-saving feature, and tweak the RGB sliders for near-perfect color. If you choose to use the 1ms Motion Blur Reduction feature, it will reduce output, but you can adjust its brightness level independently of the FreeSync setting. Below are our recommended settings.
| LG 38UC99 Calibration Settings | |
|---|---|
| Picture Mode | Custom |
| Brightness 200cd/m2 | 60 |
| Brightness 120cd/m2 | 27 |
| Brightness 100cd/m2 | 20 |
| Brightness 80cd/m2 | 12 |
| Brightness 50cd/m2 | 0 |
| Contrast | 68 |
| Gamma | 1 |
| Color Temp Custom | Red 53, Green 49, Blue 50 |
