Re: How many bits are enough for the human eye?
@Hamster: I've heard about that -- the lenses in your eye filter out UV, so if you have the lenses removed the UV photons can excite the receptors in the retina ...
Re: How many bits are enough for the human eye?
@Norm: I was about 6 to 8 when I saw my first color TV. When I was a kid, everyone had Black and White sets. I was with my mom and dad doiwntown Sheffield, England on a Saturday morning. We did that most weekends -- window shopping (we didn't have much money) -- just walking around seeing what was going on. There was a TV display in a big store window -- lots of B@W sets -- and one Color set ... it had never even struck me that Color TV was a possibility -- we all stood with our noses pressed against the store window -- I can still remember the program that was on -- something about a steel mill with the molten metal in a crucible...
hamster
8/10/2012 6:03:42 PM
User Rank Blogger
Re: How many bits are enough for the human eye?
Re: How many bits are enough for the human eye?
Many factors such as frame rates, interlacing (if applicable) contrast levels, etc play a large role in what we percieve on the screen..Even room lighting, adjacent (even off-screen) images affect what we "think" we see.......remember the "sprites" of early PC video? Today's screens are so good & realistic, we barely give them a second glance. My daughter saw a black & white show on TV recently & asked what was "THAT?".
Re: How many bits are enough for the human eye?
@Brian: Yes - that's the one - you can see that they've reduced the color depth - so with only a limited number of colors to play with the algorithm attempts to gather close shades/hues into one block of the same color.
Brian
6/29/2012 6:07:57 PM
User Rank Guru
Re: How many bits are enough for the human eye?
@Max: Re: "Have you seen that program "Becker" on TV?"
Sorry to report that I have never seen "Becker" on TV. (Funny, I had not even heard of the show!)
Is this the reduced color depth you were talking about, Becker Intro Theme?
Re: Indexed color alternative for Adam
@Brian: On the one hand the indexed color scheme would be a good idea for Adam's implementation -- using say 4 bits per pixel to point into a 12-bit lookup table woudl give us a pallette of 16 colors each of which could be one of 2^12 diferent shades/hues whatever.
On the other hand, as Adam noted, we really want a solution that is scalable for the future, and -- ultimately -- I think 24 bits is the way to go...
luminance-based color spaces
One could also use a color space based on brightness (luminance) and color (chroma) with the color portions having lesser bit depth. This would exploit our greater sensitivity to brightness than color. The conversion to RGB is more compute intensive (so one would be trading computation cost for storage savings). Such a color space also makes conversion to greyscale (or monochrome--I remember using green and later amber screens) trivial.
Even a non-linear RGB scale might be interesting (e.g., squaring the stored color value rather than bit shifting).
Re: How many bits are enough for the human eye?
@Brian: "How many bits are enough" ... this is a real hard question to answer, and I'm not sure that I have enough knowledge to say. There are a bunch of considerations here, including the fact that some people have four different types of color receptors in their eyes instead of the usual three.
Have you seen that program "Becker" on TV? The titles start with a "Posterized" sequence in which the color depth is drastically reduced so everything appears blocky. The more colors you have the "smoother" gradations appear.
I'm assuming it's like "super tasters" who can distinguish more flavors than most of us and "audiophiles" who can appreciate higher quality recordings than most of us ... I'm sure that there are some folks who can tell the difference.
A cornicopia of color schemes
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One of the things I've been wondering is whether or not the "okWireOR" module is really just a giant OR, or if the order in which things are attached matters.
I am shocked and horrified. It appears that those little scamps at Planet Analog are writing blogs pertaining to field-programmable issues.
This week's live online chat takes place on Thursday, May 23, 2013, at 1:00 p.m. ET.
Duane has decided that the time is ripe to get his ZedBoard bolted onto his robot with a Linux distribution up and running. That was the ultimate plan anyway, so why wait?
Would you class these as adages, aphorisms, axioms, dictums, epigrams, maxims, precepts, saws, truisms, or... well, what?
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