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Maintaining correct monitor colour calibration requires specialised equipment, however this colour chart provides a fixed target based on 24 bit RGB values (0to256x3).
1. As a display may change with viewing conditions, always work under the same lighting conditions and let the workstation environment stabilise for 20min.
2. Set the displays desktop (background), via the Windows Control panel> Display> Desktop> Color to a mid grey R=127 G=127 B=127.
3. Adjust the contrast and brightness so that all of the grey (top) Bk scale 21steps are equally visible, with a good black and white.

     4.With 'Adobe Gamma', or through Display> Settings> Advanced> Color (graphics driver card), adjust the background colour to match a Kodak grey card, the 50% grey variation squashes can be used to assess colour hews. Photographs are best with a monitor white colour setting of 6500K, (higher values are more blue).
  5. Attaining 21 steps on the RGB scales will depend on monitor quality, software sophistication and almost certainly be a compromise, give the grey scale priority.
  6. You should repeat the stages to fine tune, and then periodically as monitors change with time.
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