International hydrographic organization specifications for chart content and display aspects of ecdis

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S-52 Appendix 2 - IHO
S-52 Appendix 2 - IHO

White Point Calibration in the CRT: (Performed by adjusting the CRT electronics) The white point of a CRT is setup by comparing the white colour on the screen to a standard lamp. The standard lamps for this purpose are fairly rugged, and compact. The process is reasonably accurate. The process is as follows
1. Put a black signal onto the screen. Adjust the black level of each gun using the R,G,B cutoff controls) to just extinguish the raster in each colour.
2. Put a white signal on the screen, and adjust the individual gain controls of the R,G, and B guns to achieve a white that matches the standard lamp.

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