The default brightness and contrast are 100% and 50%, respectively. By choosing 20% brightness and 25% contrast I got 100nit brightness of white.
I found no faults with the quality of the image as perceived by the eye: the automatic adjustment feature worked fine, smooth color gradients were reproduced very neatly, and the viewing angles were quite good for a TN+Film matrix.
The color curves are good enough at the default settings, but are not ideal. You can see the curves deflect from the theoretical ones and in a non-monotonous way (that is, the real curve goes above the theoretical one at some spot, but below it in some other place).
A strange thing happened at the reduced brightness and contrast settings: the three curves all went up, producing a faded-out image.
The color temperature setup of the VP171s is average.
Here’s a typical graph of a fast TN+Film matrix: the maximum of the pixel rise time is about 26 milliseconds, but it goes down towards the black-white transition which allows the manufacturer to claim a very small specified response time.
The VP171s has average contrast ratio and brightness parameters. Its contrast ratio exceeds 200:1, especially with the digital connection. Of course, it cannot challenge Samsung’s monitors, but this result is anyway good against the rest of the reviewed models.
So, the VP171s (or its black version VP171b) is a good monitor on a TN+Film matrix. It is equipped with a rather fast matrix, is easy to use, and is set up well enough. On the other hand, it is inferior to Samsung’s models in functionality as well as in the results of the tests.