[sane-devel] Image Compression doesn't support in SANE protocal

Michael Hennebry hennebry at web.cs.ndsu.nodak.edu
Wed Aug 23 15:57:36 UTC 2006

On Tue, 22 Aug 2006, m. allan noah wrote:

> On Tue, 22 Aug 2006, René Rebe wrote:
> > Well that stinks as you lose a lot of detail with the lossy jpeg
> > decompression.
> even worse, if you are running the thing over the net backend, you convert
> to huge bitmap just before you transfer it over the network!
> >
> > Maybe let's add the JPEG frame type rather soon (even in SANE 1) and let's
> > add an IR (infra red) frame specification on the way as good film scanner
> > deliver for dust and the-like removal.

Perhaps with carefully crafted code,
decompression compression could be made an identity operation.
If not, perhaps it could be made idempotent.

> SANE2 could require that the frontend support jpeg, and that could become
> the default for the 'format' option.

Not having a default would better than making it a lossy compression method.

If one is going to do compression, perhaps it would be good
to have a non-loosy method as one of the options.

Mike   hennebry at web.cs.ndsu.NoDak.edu
"it stands to reason that they weren't always called the ancients."
                                                      --  Daniel Jackson

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