Re: Help/advice - basic image processing question

Chris Evans wrote:

http://home.vigay.com/photos/06-07-24/photo05.html is pretty bad at the
top left corner of the stones. Good pictures though. :)

Are you refering to what I call the Aura effect?
Or is that just a mystical presence!

I assume so - this is caused by the way JPEG works. At a basic level,
it divides the image up into many small square regions and encodes them
separately. If a square overlaps a region with two very different types
of content (in this case, the clear blue sky [easily compressible] and
the stone [less so]) it can't compress as efficiently, and as such that
square looses more apparent quality than the others, thus the artefacts
that are easily visible and distracting.

B.

.

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