Per a phone discussion with Olaf last night -

Here's a comparison of two different versions of the exact same photo, taken by him at the Dalton crossing on October 3, 1967.  The first was cropped slightly, and per Olaf's suggestion resized only enough to fit the NGDF's file size limit of 2.44MB before uploading (actually 2.24MB here).  For the second, I followed my usual procedure of resizing the first photo to 1020 × 680 pixels and then saving it as a high-quality .jpg file of about 225K before uploading** (actually 231K):



Photos copyright © 1967, 2021 by Olaf Rasmussen - All Rights Reserved.

So far as I can tell, the only detectable difference between letting the NGDF / FireFox shrink the file to its display width limit of 1024 pixels (2¹⁰) and doing it ahead of time in Photoshop is eliminating the brief flicker of the larger version in the first case, and giving potential "borrowers" a lot less resolution to play with in the second.  (Both versions of the photo were attacked with the Photoshop's "Unsharp Mask" at 60% before saving; which seems to me to have a visibly larger effect on the smaller file.)

- El Abuelo Histœrico, Greengo y Curmudgeoño de los Locomoturas Viejos y Verdes,
aka Der Grossväterlich DünkelOlivGrünDampfKesselMantelLiebHabender

p.s.  Hopefully this sneak preview will encourage Olaf to post the other 30 photos or so from his adventure of 10/03/67, during the western leg of which he left his telltale dark blue VW in full view of Ernie Robart's camera (see [ngdiscussion.net]).

 *  As noted several years ago, "ex-Sperry-ment" means "out of Sperry's mind", and NOT "Sperry is out of his (bicameral) mind".

**  Back in the 'Olden Days' of the NGDF – two or three major revisions ago – there was a file size upload limit of 200K, and I got it the habit of resizing everything to 800×600 pixels at a .jpg quality of about 60% to fit.  Later, after the easing of the restriction, I began using the common 35mm slide ratio of 3×2, or 900×600.  More recently, I realized that the NGDF shrinks photos to a width of 1K and that became my new "standard", along with a .jpg quality in the range of 65-75% (with a few exceptions both ways) to get a reasonable file size of 225K ± 25K.



Edited 5 time(s). Last edit at 04/13/2021 07:39PM by Russo Loco.