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 -----
*From:* Kim Aldis <mailto:XSI(at)kim-aldis.co.uk>
*To:* XSI(at)Softimage.COM <mailto:XSI(at)Softimage.COM>
*Sent:* Thursday, August 02, 2007 4:04 PM
*Subject:* RE: monitors?
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?
I'm just teasing ...
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 -----
*From:* Kim Aldis <mailto:XSI(at)kim-aldis.co.uk>
*To:* XSI(at)Softimage.COM <mailto:XSI(at)Softimage.COM>
*Sent:* Thursday, August 02, 2007 2:40 PM
*Subject:* RE: monitors?
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?
*From:* owner-xsi(at)Softimage.COM
<mailto:owner-xsi(at)Softimage.COM>
[mailto:owner-xsi(at)Softimage.COM] *On Behalf Of *Alexander Hemery
*Sent:* 02 August 2007 11:02
*To:* XSI(at)Softimage.COM <mailto:XSI(at)Softimage.COM>
*Subject:* Re: monitors?
Eizo r0x ..period :P
----- Original Message -----
*From:* Kim Aldis <mailto:XSI(at)kim-aldis.co.uk>
*To:* XSI(at)Softimage.COM <mailto:XSI(at)Softimage.COM>
*Sent:* Thursday, August 02, 2007 12:05 PM
*Subject:* RE: monitors?
That makes no sense. True for what?
*From:* owner-xsi(at)Softimage.COM
<mailto:owner-xsi(at)Softimage.COM>
[mailto:owner-xsi(at)Softimage.COM] *On Behalf Of *Alexander
Hemery
*Sent:* 02 August 2007 09:55
*To:* XSI(at)Softimage.COM <mailto:XSI(at)Softimage.COM>
*Subject:* Re: monitors?
If it's an eizo ...it's as true as it gets
