Accessibility
Reversing the display colours
Use this feature to improve screen visibility and to help users recognise text on the screen more easily. When this feature is activated, the device displays a negative image that reverses the colours on the screen. Reversing the colours increases the contrast between black and white.
On the Apps screen, tap Settings →Device →Accessibility →Vision, and then tick Negative colours.
Colour adjustment
Use this feature to adjust how colours are displayed on the screen if you have difficulty in distinguishing colours. The device changes the colours into more recognisable colours.
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Tap the Colour adjustment switch to activate it.
Tap Start.
Arrange the colour tiles in order of similarity, starting from the base colour.
When you are finished adjusting the colours, tap Done.
If you can distinguish the colours, no more adjustment is required.
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If the colours cannot be distinguished, tap Camera or Image.
Drag the colour adjustment bar to the left or right and tap Done. To readjust the colour, tap 
→Readjust colour.
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