
Help! There is a comet in my computer! 25
Figure 14. Look-up tables (LUTs). A LUT contains instructions for translation of the grey values on
the grabbed image recorded by a camera (A) to the displayed image on the screen (B-F). If a LUT
translates each grabbed grey value to the same displayed grey value, we see on the screen the
actual grabbed image (B). A LUT is also used to construct a negative (inverted) greyscale image
(C). The LUTs that were used to obtain the displayed images are shown in the left column. Note
that a very small difference in LUTs can drastically change the way we perceive a comet (compare
LUTs and images D and E).
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