Here are some "screensavers" (PS... they don't 'save' anything') that assist you in adjusting your screen for best tracking which includes brightness, contrast, gamma, tint, and so on.

Be aware that on MOST monitors, (and you can thank Sony for this) "brightness" and "contrast" are backwards.
Brightness is supposed to adjust the bright end of the scale (duh)...
The problem started with TV's where because of lemming stupidity they started naming one control "picture" and the other control "brightness".

Make sure your monitor is correctly "warmed up" until it's stable.
Go to where you adjust the RGB separately and keep adjusting in tiny steps until there is no "tint" in the grayscales.
With some practice you can get VERY good at this. You SHOULD just be able to see all the separate steps at both ends of the scale.
Unless you get your monitor correct FIRST, (just like in audio...) if you are editing pictures you'll never be able to figure out the end result.

If this whole procedure is new to you, set the screen adjustments ON THE COMPUTER to neutral (like brightness and contrast and gamma at 50%)
and then make all the adjustments ON THE MONITOR ITSELF. No matter whether the monitor is connected VGA, DVI, HDMI, or via a USB converter,
it will work best that way.

Some outboard monitors have "presets", like 'web', 'tv', 'spreadsheets' and so on. I HIGHLY suggest you do it all manually, sometimes called preset mode "custom color".

On a scale of 1-100, you MAY have to set all 3 levels near 100, or maybe not.
You COULD start by setting all 3 drivers (RGB) and the [so called] brightness and contrast to 50, and work outward, extrapolating from there.
Most of the circuitry that controls these things is not linear at all. Therefore 2 clicks down by 35 may be very different than 2 clicks down by 95.

Expect to be frustrated for awhile - just like in audio. Eventually you will love it.

Here below is what the overall image looks like, it's set for 1920 x 1080.
  Do NOT use the JPG below to calibrate your screen ! 

instead download the master-screen-scales_1920x1080.bmp  (6 mb) and use it as your desktop pix.

Separately, here's a PNG: master-screen-scales_1920x1080.png  (6mb)

and separately, here's an uncompressed RGB TIF: master-screen-scales_1920x1080.tif  (6mb)

If you need 1366 x 768 it's HERE. If you need a goofy mac 4k, 8k, 16k (hahahaha) resolution chart you're SOL.

The cute websafe color chart on the right is simply for historical reference and fun HEX # convenience.

Oh and one more thing: IF you need to learn about "graphics display resolution" and perhape the Mad Man Muntz lies, here's the Wikipedia page: https://en.wikipedia.org/wiki/Graphics_display_resolution