The reason for Mach banding in images, particularly in the lower
registers is the eye’s ability to see differences comparatively
much better when the differences are side by side. But not when there even
slightly removed from each other. As distance increases from the boundary between
similar tones the eye no longer sees any difference and assumes the band isn’t
even. It is.
The only way you can be sure that the difference you’re
seeing is real and not imagined is to measure it with equipment. Honestly, your
eye just isn’t up to it. If the spider thingy is telling you they’re
the same I’d be inclined to believe the spider thingy, not my eye. It’s
way more accurate.
I know that cathode tubes used to be a pain because the spectral
response was spikey and there were colours you could get in print that you
couldn’t get on a monitor. I’m not sure if the same is true of flat
screen displays, it’s a long time since I’ve needed to care.
Why you shouldn’t believe your eyes. http://en.wikipedia.org/wiki/Image:Grey_square_optical_illusion.PNG
From:
owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] On Behalf Of Alexander
Hemery
Sent: 02 August 2007 14:19
To: XSI(at)Softimage.COM
Subject: Re: monitors?
Agreed,
I don't think we're able to percieve minor tonal differences either ..but
I'm talking extreme here (since I can spot the difference :P) , and I've tried
to calibrate them with the lights off .. in a dark room.
Some
guy I talked to at the LG repair shop said that these lcd panels can vary
(alot) depending on what factory they come from or even the batch.
Imagine
I had to take both my monitors there and try at least 10 others to find a
good match ..where both looked like having the same temperature.
-----
Original Message -----
Sent: Thursday, August 02,
2007 4:04 PM
The human eye is very bad at judging colour or tonal differences
unless the colours are adjacent to each other and it’s easily swayed in
its judgment by what’s around it. You may not believe it but you’re
not actually able to make that kind of judgment unless the difference is
extreme. It’s more likely that whatever light or background colours are
in the environment surrounding the monitors is swaying your perception. In my
own study the colour I perceive on my monitor varies according to the weather –
warm when it’s overcast, cooler when the sun’s out – and also
according to whether I’ve been using the laptop monitor, which is a tad
on the warm side. The LCD is correctly calibrated but tends to look cool after
a stint on the crappy laptop screen.
From: owner-xsi(at)Softimage.COM
[mailto:owner-xsi(at)Softimage.COM] On Behalf Of Alexander Hemery
Sent: 02 August 2007 13:49
To: XSI(at)Softimage.COM
Subject: Re: monitors?
but
seriously, I think you will agree that they are superior as far as image quality
and color reproduction is concerned. And that they would be 'correct' if
properly calibrated for a medium .. TV/print etc.
I've
even used that spider calibration thingy on two LG's I have at home and white
still looks greenish-white....
Two
Dell's I have at work show the middle gray, brownish... and
ofcourse ..both monitors in both occasions can't show the exact same colours
even with the exact same settings.
...either
that or i'm going color blind.
----- Original Message -----
Sent: Thursday, August 02,
2007 2:40 PM
So you’re telling me that it’s automagically correct
for web, TV, DVD, CMYK, every printer ever made, all at the same time?
Excellent. Is it right for film too?
-----
Original Message -----
Sent: Thursday, August 02,
2007 12:05 PM
That makes no sense. True for what?
If
it's an eizo ...it's as true as it gets
