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SMPTE — contd.
Test Deflection linearity
Method If the overall height and width of the display’s
active video area match the sizes in the format,
the large circle should be perfectly round. Each
box in the crosshatch pattern should be the same
size and shape. For more information on testing
linearity, please see the discussion on the Linearty
test image.
Test High contrast resolution
Method All the 0 and 100% level stripes in all the resolution
patches should be separate and distinct.
Test Low contrast resolution and noise
Method All the mid-level 2 on - 2 off stripes in all the
resolution patches should be visible and distinct.
This is a sensitive test for noise in the display’s
video amplifiers.
Test Quick gamma check
Method The average brightness level of the small gamma
dither box should match the brightness of the larger
surrounding box. This is a visual check to see if
the display’s gamma correction is producing the
correct mid-level response.
Test Video gain linearity and gamma
Method The individual gray-scale boxes all should be at
their indicated levels. A small aperture photometer
is usually required to get accurate and repeatable
readings.
Test Contrast and brightness check
Method On a display with properly adjusted brightness
and contrast controls, both the 5% and 95% contrast
boxes should be clearly visible inside their larger
surrounding 0% and 100% boxes.