Your clarification has helped; and I have no significant disagreement with the gist of your statements now that I understand what you are saying and what you are using as your reference criteria.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Anthony Atkielski Sent: Sunday, June 09, 2002 8:14 PM To: [EMAIL PROTECTED] Subject: [filmscanners] Re: JPG sharpening [was: Color spaces for different purposes] Laurie writes: > I agree with this; but in many if not most > cases, the compression level used or required > is greater then the lowest possible amount, > ranging from level 6 to level 3 in order to > get the file small enough to be an email attachment > or a web site download. I was thinking only of archived photos. For Web and e-mail use, in most cases you can crank the compression all the way up in Photoshop (that is, set it down to 1, the highest compression setting) and the image will still look fine. Unlike some editing programs, Photoshop won't let you compress the image so much that it really looks bad on the screen; even the worst setting is still pretty good. > This statement I do not understand; please > elaborate. Most scans, at full resolution, do not actually hold enough detail to make full use of that resolution, so compressing them into JPEGs really doesn't sacrifice anything. Additionally, with the lowest compression settings of Photoshop (level 10), I have yet to be able to distinguish between the original and the JPEG in terms of image detail, even when greatly magnifying the image. Photoshop is very conservative. > Surely, this cannot be the case if we are talking > about raw data as opposed to encoded compressed > data even at the lowest setting in which there > still is some compression of the raw data. There is always some loss in a mathematical sense and a strict sense, but in practice you won't be able to see the loss when storing full-resolution scans as JPEGs with the quality setting set as high as it will go. I've never had any problem losing detail in archived JPEGs as long as I use the highest quality setting. I sure would like to see a 16-bit version of the JPEG standard, though. ---------------------------------------------------------------------------- ------------ 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