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Uncalibrated – Maximum Backlight Level
Cooler Master rates the GM27-FQS at 300 nits typical, and my sample came close with 276 nits peak output in SDR mode. There is a little more brightness available for HDR content, which I’ll talk about on page five. The black level is about average for the panel’s backlight intensity, so contrast is also average at 946:1. You can increase dynamic range by turning DCR on, which lowers the black level noticeably. The ratio goes up to around 3,000:1 as a result but some fine shadow detail is clipped in the process.
After Calibration to 200 nits
Whether you calibrate as I did or simply choose the DCI-P3 color space, adjustment increases contrast a bit to 1,039:1. This is a subtly visible gain in image depth which also improves color saturation. I recommend using the settings shown on page one or just switching to the DCI-P3 color space and leaving the remaining options at their defaults.
Hot spots at the top of the screen reduce the ANSI contrast score to 828.9:1. The rest of the screen shows decent pop and depth, so this result doesn’t indicate a significant reduction in image quality. Other GM27-FQS samples may post higher ANSI scores depending on their screen uniformity.
