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[filmscanners] RE: Color spaces for different purposes



Alas, either I am misunderstanding you or I am terribly confused; both
options are entirely possible.
>I would convert and sharpen before compressing
If you convert any file format to a JPG format, are you not coverting and
compressing at the same time?  I did not think that in fact they are
practically separate and distinct operations even if the act of coverting
presents itself to the user as if it were being done in stages.  Thus, if I
am correct about the conversion and compression processes being from the
users point of view for all intents and purposes one in the same, how does
one sharpen between the conversion stage and the compression stage?

> -----Original Message-----
> From: filmscanners_owner@halftone.co.uk
> [mailto:filmscanners_owner@halftone.co.uk]On Behalf Of Maris V. Lidaka
> Sr.
> Sent: Saturday, June 08, 2002 1:07 PM
> To: laurie@advancenet.net
> Subject: [filmscanners] Re: Color spaces for different purposes
>
>
> I would convert and sharpen before compressing.  It may or
> may not help -
> I'm not an expert - but it would deal with any artifacts that
> might possibly
> be introduced in the conversion process itself.  I would not compress,
> re-open and recompress absent drastic sharpening artifacts in
> the compressed
> JPG.
>
> Maris
>
> ----- Original Message -----
> From: "Laurie Solomon" <laurie@advancenet.net>
> To: <mlidaka@ameritech.net>
> Sent: Saturday, June 08, 2002 11:56 AM
> Subject: [filmscanners] RE: Color spaces for different purposes
>
>
> >It would probably be better to convert to JPG first and then sharpen.
> Theoretically maybe; but out of curiosity, how does one do
> this in actuality
> when one would have to first decompress the JPG file before
> one could carry
> out the sharpening operations.  Afterwhich, one would then
> recompress the
> file again in its altered state which would be what typically
> causes the
> artifacts and deterioration in JPG files to begin with?
>
> -----Original Message-----
> From: filmscanners_owner@halftone.co.uk
> [mailto:filmscanners_owner@halftone.co.uk]On Behalf Of Maris V. Lidaka
> Sr.
> Sent: Saturday, June 08, 2002 11:33 AM
> To: laurie@advancenet.net
> Subject: [filmscanners] Re: Color spaces for different purposes
>
>
> Probably the artifacts created in the compression process.  It would
> probably be better to convert to JPG first and then sharpen.
>
> Maris
>
> ----- Original Message -----
> From: "Ken Durling" <kdurling@earthlink.net>
> To: <mlidaka@ameritech.net>
> Sent: Saturday, June 08, 2002 11:05 AM
> Subject: [filmscanners] Re: Color spaces for different purposes
>
>
> On Sat, 8 Jun 2002 16:17:30 +0100, you wrote:
>
> >Personally I do some sharpening for an archival image that
> may end up going
> >to different outputs. This is only a minor sharpening to restore the
> >sharpness of the original which is almost always softened by
> the scanning
> >process. Most images will benefit from further sharpening
> when targeting
> for
> >a specific output but this should not really be done for an
> archival copy.
>
>
> Speaking of sharpening - I think I understand this in a sort of sloppy
> "intuitive" way, but could someone offer a technical explanation of
> why sharpening has so much more visible effect on jpegs as opposed to
> TIFFs?
>
>
> Ken Durling
>
> Visit my new easier-to-browse PhotoSIG portfolio:
> http://www.photosig.com/viewuser.php?id=203
>
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