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The special lossless function is also known as predictive lossless coding. It
ensures that at the resolution at which the image is no loss of any detail that was
there in the original source image.

Overview of JPEG Components JPEG Standard components are:

I. Baseline Sequential Codec
II. OCT Progressive Mode
III. (Hi) Predictive Lossless Encoding

IV. Hierarchical Mode.

These four components describe four four different levels of JPEG compression.
The baseline sequential code defines a rich compression scheme the other three
modes describe enhancements to this baseline scheme for achieving different
results appearance of a jumpy screen.