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How can you tell which band is the infrared on a .sid aerial

Question asked by BoilerAggie on Nov 12, 2014
Latest reply on Nov 13, 2014 by BoilerAggie

I have a .sid raster that apparently has infrared. But it only has 3 bands, making it most likely RGI or something similar. My metadata does not specifically tell me which band corresponds to which wavelengths. When I load it into GIS it defaults to R=band1, G=band2, and B=band3. Is it safe to assume band 3 is infrared? Is there a way to know for sure? I have no other supporting documentation to help me, just the raster. -- Thanks


Note: there is a slight possibility that the image does not actually have infrared. When I look at the lake, it is almost black like other false color images suggesting it probably does have infrared. I just need be able to know without a doubt if I have infrared or not.