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Splitting JPEG files into RGB components

I am attempting to read a JPEG file into IDL and then split it into the
three colour
components so that each component can be analysed separately.  I have
able to read it in and display it on the screen but am finding it
difficult to separate it into its red,green,blue components. Is this at
all possible with JPEG compression, and if so can anyone give me ome
hints on how to go about it?