Found a great page on lossy vs lossless compression, testing the user to see if you can tell the difference. Try the test and let me know how you did.
I got 7 out of 10.
Not Office Safe
n1vux on 2005-07-15T17:52:50
at least not for some offices.
Re:Not Office Safe
Matts on 2005-07-15T18:53:23
I think (IIRC) there's only one raunchy image in there.
Re:Not Office Safe
n1vux on 2005-07-15T19:29:12
well, that was the first one displayed, and I had to close the window fast ...
Re:Not Office Safe
jdavidb on 2005-08-02T03:40:58
Not very safe for browsing around one's wife, either!
8 out of 10
ajt on 2005-07-15T19:57:17
I started badly but quickly reaslised that it's easy to spot a JPEG if there is gradual colour JPEGs look more blotchy. So the ones with the grey backgrounds turned out to be dead easy, those with solid backs were much harder to discriminate.
10 out of 10
I found the "quality 11" ones to be very difficult, having to go on the subtle gradient splotchiness that ajt mentioned. The "quality 7" ones typically had serious edge color distortion.
Re:10 out of 10
Matts on 2005-07-15T20:36:00
I think what's interesting about the test is that you really do have to look hard. The blotchiness doesn't stand out.
9/10
Not sure how I did so well. My crummy 1028x768 laptop lcd was a heck of a handicap. I mostly used shadows to figure it out. For some reason I had an easier time if there was some red in the image.
Interesting test.
9/10
Theory on 2005-07-17T00:34:07
I got nine out of ten. But I'm a really picky bastard. My wife is a graphic designer, but she asks
me to proof stuff when she wants to know if there's too much dot gain or if an image is misplaced by
.1 pica.
—Theory
On a laptop, it was a near wash
dws on 2005-07-18T03:45:41
I was able to spot a few artifacts near heads and shoulders, and once in the shadows, but on my laptop, the best I could do was 5.
