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22. Diagonal 1
The Diagonal 1 pattern is a set of 3 diagonal coloured lines (red, white
and blue) within a white square in the middle of the screen. This pattern
is used to check for distortion and alignment issues in the center of the
screen.
23. Diagonal 2
The Diagonal 2 pattern is 2 diagonal lines that travel from the corners to
the exact center of the display. This can be used to check for alignment
and geometry issues, particularly with projectors. The outer border of
the screen also has a white outline to verify that the full image is being
displayed.
24. Dot
The Dot pattern is a full field black & white pattern with a repeating
pattern of single-pixel (resolutions below 4K) or 4-pixel (at 4K) white
dots surrounded by single pixels of black. This pattern is ideal for testing
the signal path/display for bandwidth issues, interference, cross-talk or
scaling issues.
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