Schecterman opened this issue on Oct 20, 2010 ยท 31 posts
bagginsbill posted Wed, 20 October 2010 at 12:18 PM
Quote - because its meant to be a losless compression
Huh? Double huh?
JPEG is, by definition, lossy at any quality.
The fundamental mechanism it uses is to throw away information that isn't really needed in order for a human to perceive the compressed picture as being largely the same as the original. The quality adjuster simply determines how much info to discard - but it never keeps all of it.
Most of the JPEG compressors (but not all) don't even sample chrominance at every pixel - they store it in 2 by 2 averages, even at "100%" quality.
Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)