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New Wrong reason
24 bits are probably* enough to display any image as well as can be done on a normal desktop computer. But if your goal is really high quality images, you really want more bits when processing the image. Generally 24 bit images consist of 8 bit values for red, green and blue. This means only 256 values for each component, which means error can accumulate when multiple calculations are done to an image before it is displayed.

The real reason the move to 64 bit is largly not revelent to graphics is that the high performance internal calculations that can benefit from being done with more bits often already are. All of the current x86 processors have extensions that let some calculations be done with more then 32 bits already. There are several variations, but one example the Streaming SIMD Extensions 2 found on Pentium 4 processors can do up to 128 bit math.

Jay

*I say probably because there are complications that make it hard to be sure. Different people have different degrees of sensitivity to different parts of the spectrum, distortion caused by light sources other then the moniter, differences in the exact spectrums produced by different moniters and other messy factors make a precise calculation hard.
New And to get even messier . .
. . illuminate a room with a neon glow lamp (which will have some argon contamination). Note that you can see a wide range of color at impossibly low light levels using only two lines of the spectrum (neon (orange) and argon (violet)).

As an exercise for the student. reconcile your observations with accepted color theory in 300 words or less.
[link|http://www.aaxnet.com|AAx]
New Re: And to get even messier . .
Is there a difference between a "neon glow lamp" and a "Budweiser" sign? For some reason bar neon lights always get on my nerves, but I can't say why.
-drl
New Difference in scale and gas mix.
Bar neons are ionized at very high voltages, and gasses are mixed to get desired color. Tubes are sometimes tinted to modify the color further. A neon glow lamp generally runs at 115 volts and is small.

The problem with your nerves is probably that these lamps have little latency, so they flicker at 120 Cycles (Hz, for you younger guys).

I probably still have the neon glow lamp (packed in with my collection of vacuum tubes) that introduced me to the color phenomenon (back in my Jr. Scientist days (one of my several "past lives")). It's a 115 volt bulb about the size of a 15 Watt incandescent with opposing semicircles as the illumination surface. I was trying it out as a darkroom light and was amazed when I could see colors with less light than moonlight and with a single band of the spectrum, in defiance of what I'd been taught about color in school (this was neither the first nor the last episode of discovering that what you are taught in school is crap).

Further investigation came up with the facts that neon is gnerally contaminated with argon resulting in a violet sideband, the eye apparently uses ratios between the two bands to generate color, and this phenominon is not entirely unknown to science, but is rarely admintted to.
[link|http://www.aaxnet.com|AAx]
Expand Edited by Andrew Grygus July 21, 2003, 12:08:56 AM EDT
New Ah: Mr. Edwin Land, ___I presume ;-)
New Cones?
Could be the cones are highly stimulated by these pure frequencies.

I found this:

[link|http://bulbmuseum.net/bulbs/ne34.htm|http://bulbmuseum.net/bulbs/ne34.htm]

I've gotta have one of those :)
-drl
New Yeah, that's the critter.
That's a dead ringer for the bulb I'm talking about.
[link|http://www.aaxnet.com|AAx]
     MLP: TheInq on what 64-bits is and isn't good for. - (Another Scott) - (17)
         Nice! -NT - (deSitter)
         Re: MLP: TheInq on what 64-bits is and isn't good for. - (qstephens) - (15)
             Saw it. Good rebuttal. :-) -NT - (Another Scott)
             Linkz0r? -NT - (pwhysall) - (1)
                 It got moved off the front page. - (Another Scott)
             Not sure I agree on one point you make... - (a6l6e6x) - (11)
                 Wrong reason - (JayMehaffey) - (6)
                     And to get even messier . . - (Andrew Grygus) - (5)
                         Re: And to get even messier . . - (deSitter) - (1)
                             Difference in scale and gas mix. - (Andrew Grygus)
                         Ah: Mr. Edwin Land, ___I presume ;-) -NT - (Ashton)
                         Cones? - (deSitter) - (1)
                             Yeah, that's the critter. - (Andrew Grygus)
                 About colour - (pwhysall)
                 Gray range would improve - (SpiceWare) - (2)
                     Not so, IIRC - (pwhysall) - (1)
                         Haven't found much - (SpiceWare)

I'm away from zIWT for a day or two and look what happens! That'll learn me.
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