John Hudson wrote:
> You mention "JPEG blocking". What is this, what causes it and where is it
> seen on the image?
JPEG blocking, also known as JPEG Compression Artefacting is an effect you get
from the JPEG compression algorithm.
Basically, JPEG chops an image into 8x8 pixel blocks (or 16x16 if you have the
compression turned WAY up), then processes those blocks, repeating previous
blocks as necessary to save space. At some compression levels, those 8x8
blocks are visible - that's JPEG blocking.
... Which is why you save the RAWs, convert to JPEG for display, and print
from uncompressed TIFFs. Or at least that's what I do. Maybe I'm just a little
obsessive about quality :)
--
Phil. | (\_/) This is Bunny. Copy and paste Bunny
oly@xxxxxxxxxxxxx | (='.'=) into your signature to help him gain
http://www.philpem.me.uk/ | (")_(") world domination.
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|