>At this point it's moot True, especially with regard to the original basis for the discussion. :-) However, it may not be moot with respect to spin-off issues. :-)
> conversion from TIFF to JPG reduces file size and >apparently compresses, I would think to Maximum quality. Sharpening at that <point was what I was suggesting, before saving as a more-compressed JPG Saving a file as a JPG file at a level of compression involving the least amount of compression would obviously result in much less lost empirical information (e.g., actual image data) than to save at higher compression levels; however, I think it is questionable if the remaining empirical data would represent maximum quality in all cases. But to change the existing data in the original JPG file by sharpening and then resaving the result to a more compressed state is one of the sorts of actions which tends to produce the often found JPG artifacts and deterioration of the image that such a file can produce. Obviously, the more often one changes the level of compression in the resaving of an openned JPG file as well as the more information that one changes between such compressions the greater the possibility of artifacts and deterioration of the resulting image. At least, as far as the earlier versions of JPG ( cannot speak for JPG 2000), the compression was a lossy operation in which algorithms were used during compression to discard redundant data and to generate new data based on the retained data and the algorithm upon expanding the file. To recompress at a new level means that one would be applying the algorithm to increased levels of artificially created simulated data with each such resaving at a different level. Thus, the net result would be to be creating or interpolating new data based on existing data that itself was artifically created by a similar method with less and less of the data that makes up the file being the original data from the capture. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Maris V. Lidaka Sr. Sent: Saturday, June 08, 2002 4:40 PM To: [EMAIL PROTECTED] Subject: [filmscanners] Re: Color spaces for different purposes At this point it's moot since Ken said he resizes in TIFF and sharpens, but I think you are correct - conversion from TIFF to JPG reduces file size and apparently compresses, I would think to Maximum quality. Sharpening at that point was what I was suggesting, before saving as a more-compressed JPG. Maris ----- Original Message ----- From: "Laurie Solomon" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Saturday, June 08, 2002 3:35 PM Subject: [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: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of Maris V. Lidaka > Sr. > Sent: Saturday, June 08, 2002 1:07 PM > To: [EMAIL PROTECTED] > 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 [remainder snipped] ---------------------------------------------------------------------------- ------------ Unsubscribe by mail to [EMAIL PROTECTED], with 'unsubscribe filmscanners' or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or body ---------------------------------------------------------------------------------------- Unsubscribe by mail to [EMAIL PROTECTED], with 'unsubscribe filmscanners' or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or body