.  The sample parameter identifies which sample is to be
encoded or decoded if the image is organized with <TT>PlanarConfig</TT>=2
(separate planes).  This is important for algorithms such as JPEG.
If <TT>PlanarConfig</TT>=1 (interleaved), then sample will always be 0.

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<H3 id="Other">Other Comments</H3>
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The library handles most I/O buffering.  There are two data buffers
when decoding data: a raw data buffer that holds all the data in a
strip, and a user-supplied scanline bu