Level 2 Help for ADDNOISE

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Triggers additive noise to be created.
The standard deviation of the distribution for additive noise.

Triggers shot noise to be created.
Ccd gain constant in electrons/dn.
Typical values for galileo were gain=30 in gain state 4 and gain=170 in
gain state 2.

Triggers bit error noise to be created.
For example a bit error rate of 100 means one bit in 100 is hit on the average.

Note, the algorithm does not permit a pixel to be hit more than once.
Note, see the BITS keyword.

Bits per pixel. Defaults to 8. Only used in the bit error "RATE" mode.
This is the lower number of bits which can be changed per word. 

Note: bits does not default to the format type. If you have HALF data but
only 12 bits/pixel in a 16 bit field you must set bits=12 not to 16.
Avoid changing the sign bit by setting bits to one less than the word length.

The starting seed for the random number generator. Defaults to time of day.