If necessary, you can enter more than one NoData value for your source images. 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).
For more information, see:
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