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Help with jpeg image problem

I'm not sure if anyone can offer any advice but it doesn't hurt to try.

I'm using libjpeg to decode a jpeg image stream. My hardware is a 555 16bpp ARM9
(65535 colors) and the image header reads 24bpp RGB and I'm assuming that's 888 format.
When I decode the image, I see the gradient change which I didn't expect even for a 
grayscale image.
I'm doing everything the docs says and followed the examples with the only difference
being I'm only using the upper 5 bits.
In addition to seeing the well defined color change gradients, I'm seeing a lot
of the image changes pixel values. For example is goes from darkgray to lightgray from one
stream to the other, although the image has not changed.
Has anyone worked with this library and seen this before? Any ideas?


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