You enter one or more NoData values as a string in the Set NoData window. For example, to specify that channel 1 has a NoData value of -9999, channel 2 is 0, and channel 3 is 255, enter -9999,0,255. You can also, if necessary, skip a channel. For example, to specify that channel 1 has no defined NoData value, but you want to use 0 and 255, respectively, for channel 2 and channel 3, enter ,0,255 (notice the comma before the zero).
To set one or more NoData values
That is, the images to which the NoData value or values you specify are based on your selection.
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