[OT]Re: how to edit id3 tags in KDE?
James Richard Tyrer
tyrerj at acm.org
Sat Sep 27 20:17:38 BST 2008
Matthew Woehlke wrote:
> James Richard Tyrer wrote:
>> [snip] JPEG2000 is noticeably better because it will
>> do lossless compression and doesn't have the block artifacts, yet the
>> market has standardized on the old and obsolete standard causing real
>> problems with digital cameras.
> Not for *me* it doesn't :-D. I shot maybe a dozen pictures before
> turning on lossless-compressed raw (which I realize now was a mistake,
> turning on raw should have been the very first thing I did). Forget the
> compression format, anyone not shooting raw is likely already losing
> almost half the image quality to the camera's built-in tone mapping.
What you describe is the problem. The lack of a standard lossless
compressed format forces you to shoot RAW which contains a lot of
information that you don't need for most uses, has to be processed by
special software and is NOT a standard format on most cameras. Some of
these issues are addressed by cameras that use Adobe DNC, but for most
people, what they really need is a standard lossless compression format.
> (Actually, I suppose if I fiddled with it, I could get better jpg's, but
> why bother when rawstudio can produce so much better results by throwing
> a general-purpose CPU at the problem?)
No, there is no way for the camera to produce lossless JPEGs because
that is a separate format that isn't widely used. With JPEG2000, all
you need to do is select integer and 100% and you get lossless. And, as
I previously said, since JPEG2000 doesn't have the artifacts, you get
better looking images for a given file size.
So, to obtain good quality photos, you have to shoot RAW even though you
don't really need RAW, you just need a lossless compressed format.
Compressed RAW does help to some extent; however even compressed RAW
files are huge. Some cameras offer TIFF, but this is worse since they
pad the file to 16 bits per (color per) pixel. I do not know of a
camera that will save 8 bits per (color per) pixel with lossless
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