Photoshop apparently uses different algorithms (at least up to version 8) for "Save As" and "Save for Web" actions. If you save your images via "Save As", they are generally bigger in filesize and worse in quality at the same quality setting than if you use "Save for Web".


Irfanview has one of the best image compression algorithms for JPEG graphics format. It's free for use so it's worth a try, though it only runs windows systems.

add it to the article if you like -watchout 09:38, 23 September 2006 (EDT)

Interesting info. Do you have sources that we can point to?   --Mikk (T) 10:00, 23 September 2006 (EDT)
If you mean the photoshop thing, I tested it myself in a comparison between photoshop, irfanview, ms photo editor (was bundled with ms office, not anymore I heard) and ms paint (:P) and discovered it accidentally when I clicked the wrong entry in the menu and was too lazy to cancel and click again... (or something like that, I don't remember exactly but it sounds like me...) This was back in 2000 or so, and I checked again casually when I got access to a new photoshop version because I was just curious. The test itself I posted on a forum and got so "much" feedback that I decided to spare the writing time. Sorry. -watchout 10:42, 23 September 2006 (EDT)
Irfanview certainly is one of the best (and free) image progs, but I don't have a source for it either :) -- Kirkburn (talk) 10:19, 23 September 2006 (EDT)
Ah, and Irfanview also supports JPEG 2000 ( format, which supports lossless (and "almost lossless") compression too! But PNG is still the better one for images with many geometric shapes, clear gradients, etc. -watchout 10:42, 23 September 2006 (EDT)