The Colour Test shall be applied on the day and dusk colour tables.
Before the Colour Test diagram is used, the black-adjust symbol SY(BLKADJ) shall be brought up on the screen and the contrast and brightness controls (or equivalent controls for an LCD) shall be adjusted as follows:
First, set contrast to a maximum, brightness to a minimum. Look at the black-adjust symbol. Then either:
2A. If the centre square is not visible, turn up the brightness until it just appears.
OR:
2B. If the centre square is clearly visible (with contrast at maximum, brightness at minimum), turn the contrast down until the inner square disappears, then turn contrast back up until the inner square is just visible again.
(If the above adjustment is not successful, select a more appropriate colour table and repeat this procedure).
The "black level" is then correctly set. If a brighter display is required use the contrast control, but preferably do not adjust the controls unless lighting conditions on the bridge change.
The test consists of being able to distinguish the background colours and to pick out the like foreground colours, i.e. to say that squares 3, 5, 11, 15, 18 and 20 all have a shallow water blue background, and that squares 3, 10 and 17 have a grey line.
NOTE: The test above uses the black-adjust symbol for the purpose of a type approval test. The other purpose of the black-adjust symbol SY(BLKADJ) is to allow the mariner to adjust the display for ambient illumination on the bridge of a ship. An ECDIS shall have the black-adjust symbol displayed whenever the mariner is adjusting the display (i.e. depending on the technology of the display brilliance, brightness, contrast, etc.), as required by section 4.2.4.5 of S-52 e6.1.0.
Share with your friends: |
