
432 Chapter 10
The linear ramp covers all values which are legal
within a SMPTE SDI signal, i.e. 4–1019. The lin-
ear ramp for UHD is 3 × 1015 pixels wide and for
HD is 1.5 × 1015 pixels wide. The ramp increments
linearly and is converted from double precision
oating point to integer using a oor function.
The ramp is centered in the test card and the
space to the left of the signal is achromatic at
code level 64 and to the right is achromatic at
code level 721. One-pixel wide tick marks appear
at the values 64, 721 and 94
The two sample interleave test pattern section
(at bottom left) has several letters ...