Computer Screen Resolution - to view opals correctly

calibration for color correction

How do I set up my Computer Screen for Viewing Opals Online?

This page will help you set a white point and balance your screen’s brightness and contrast settings to get the most of of the opal images displayed on If you are not familiar with your monitor’s controls and set-up process, now is a good time to get your owner’s manual, then just follow the steps below.

Adjust Brightness and Contrast

When your screen is properly adjusted, you will see 11 distinct zones in the image below, from pure black to pure white. If you do not see all 11 zones, use your screen’s contrast and brightness controls to make any necessary adjustments.

Set White Point

The gray-scale below presents 24 shades of gray from pure white to solid black. The pure white block at the far left should merge with the pure white bar along the top, while the second block of very light gray should display a bit darker than pure white. The solid black block at the far right should merge with the solid black bar along the bottom, while the block just to the left should display a bit lighter than solid black.

In the 2×2 table below, are four colors. One should be absolute black. Nothing on your monitor should be darker than the black square. Look at the black border around your monitor. It should be as black as this square. Next check the white square. Nothing should be lighter than it. The gray boxes and the white box should have no tints of other colors in them. No pink or blue!

Examine the graph below. Under the 0% column, there should be NO color, just plain bright white. If it is gray or dingy or has a color cast, adjust your monitor until that area is plain white. Under the 100% column, the colors should be recognizable, with a full rich representation. If they appear washed out, your monitor is probably
set too bright.

The best way to set this is to adjust your gamma curve up or down until the 10% shade difference between the 90% bars and the 100% bars can just be seen. If you adjust it too dark, you will not be able to see a difference between 90% and 100%. As you lighten them up, just at the moment you start to see the difference between the 90% bars and the 100% bars, STOP. The cyan bar will always appear correct first, but keep going until you start to see the 90% tint in the magenta and black bars as well. The yellow bar may never come in correctly, but don’t worry about it. The magenta and black bars are the most important. Once your white point is set and your tint bars look correct, you should be ready to view the opal images on, with the assurance
you are seeing them as the photographer Peter intended them to be seen.

Refer to your monitor’s instructions for adjusting contrast, brightness, and setting gamma values. Most monitors should have brightness and contrast controls, either adjustable wheels or buttons that allow up or down adjustments to be made. Gamma is probably set by selecting a color temperature value. If your monitor permits this, start with a white point value of 6500K (degrees Kelvin).

If you have any suggestions for improvements for this guide please email

Computer calibration for opals