Kindle Battery Surgery [Success!]

[pdurrant]

Originally Posted by geekmaster

As it turns out, you are correct for one particular color model still used by painters:
https://en.wikipedia.org/wiki/RYB_color_model

I've learned someting new too. I'd always assumed that the RYB model was a slight misnomer and approximation to CMY. But in fact it is a separate system, just not the most efficient, which is why colour printing uses CMY(K).

The most common* human eye detects red green and blue lightwaves. So additive (e.g. LCD TV screens) use red green and blue pixels.

But when adding pigments to white paper, each pigment absorbs some light and reflects others. Combining pigments reduces the amount of light reflected, as the light that's reflected is only that reflected by both pigments.

Cyan reflects green and blue light, absorbing red
Magenta reflects red and blue light, absorbing green
Yellow reflects red and green light, absorbing blue.

So mixing 100% cyan and magenta absorbs both red and green, leaving just blue reflected light. Similarly for other combinations.

And by varying the percentages of each pigments, it's possible to arrange for the reflection of any proportions of red, green and blue, theoretically allowing full colour printing.

Although there are colour systems that use more - hexachrome is a case in point, which adds an orange and a green into the mix.


*There are people who don't have the detectors for all three colours, giving rise the various kinds of colour-blindness. Interestingly, there are some people who have four different colour detectors, as there are variants in the genes for the red and green receptors. In at least one person, this has been shown to give enhanced colour vision.

[Cinisajoy]

Your last sentence may be the reason my husband can detect very subtle color changes.
Oh and from just the three primaries, black and white, there are 454 shades of DMC floss and 18 variegated skeins.

[knc1]

Originally Posted by Cinisajoy

Your last sentence may be the reason my husband can detect very subtle color changes.
Oh and from just the three primaries, black and white, there are 454 shades of DMC floss and 18 variegated skeins.

It is not as rare as the quote makes it sound.

How about shades of red?
Can he pick out two that look different to him, that look the same to you?

Some people have a greater range of detection in the 'red' range receptors (about as rare as the above condition).

[geekmaster]

I recall reading that folks with the fourth color dimension are always female, for genetic reasons. Our reduced color perception to them would be like the two dimensional field of view of residents of Flatland are to us in the third dimension. Even imagining what we are missing is like trying to draw a tesseract. And even their expanded color space is a mere sliver of available frequency spectrum. There is so much we cannot see, without our specialized imaging technology. And from a physics point of view, color is merely a perceptual illusion.

[knc1]

And then there is one type of color blindness (I forget which one) that was sought after among solders in WW-II.

Camouflage in the jungle stood out from the jungle colors like a "here we are" sign.

It made these people very popular with the Army for gunfire target spotters.

[Cinisajoy]

Originally Posted by knc1

And then there is one type of color blindness (I forget which one) that was sought after among solders in WW-II.

Camouflage in the jungle stood out from the jungle colors like a "here we are" sign.

It made these people very popular with the Army for gunfire target spotters.

In answer to your question about red, yes.

No can you please get Melonie and beefcake off the brain? Your misspelled word in the quoted post is awesome. Though they probably did solder in WW-II.

[knc1]

Originally Posted by Cinisajoy

In answer to your question about red, yes.
- - - -

The condition has a name -
Some web-searching should turn up information about the condition.

I was once asked, years ago, to come up with an alternate css file for a web-site that would make it look (to people like your husband) the same as the majority of viewers.

Which I thought was a waste of time, people like your husband have had a life time to adapt to the differences.
But they where paying for my time, so what-the-hell. "The boss is always right rule."

[Cinisajoy]

Not that interested, though the differences sure came in handy when we were sorting floss from kits.
A few years back, we picked up a pickup load of cross stitch stuff for $20.

[geekmaster]

Originally Posted by pdurrant

[...] The most common* human eye detects red green and blue lightwaves. So additive (e.g. LCD TV screens) use red green and blue pixels. [...]

Actually, each "perceptual color" we detect consists of a wide band of possible color frequencies interdependent on different waveband color sensors, with an amplitude envelope of Gaussian distribution. Our color detectors overlap when the amplitude (brightness) is high enough. And in fact, our red detectors can see infrared when it is of strong enough amplitude AND it is not masked by other nearby "reddish" color frequencies.

Another way to verify that you can see infrared in special conditions is to grab a powerful infrared TV remote control, let your eyes dark adapt in a dark room, then shine it directly into one eye at close range while you press a button (but not for long) and you should see a dull red flicker. When you can see infrafed at all, it is very very high intensity, so as the somewhat humorous laser warning sticker says "do not try this with your remaining eye". But seriously, I have done it and it works, and I did not go blind (though I suppose that could be because my free hand was not busy "taking care of business", as in the classic mother's warning).

And back to color detection depending on signal strength, this is also why we can view monochromatic colors of frequencies BETWEEN those at the center of the Red/Green/Blue color frequency bands we detect. Our visual processing centers compare and balance them to see the relative strengths and positions of the summation of frequencies falling in the frequency range between them, and this is why an amber LED (single color frequency) looks yellow, and a pair of red and green LEDs (as in a color OLED display) can be set to appear as exactly the same color. So really, the colors we perceive in our narrow band of visible frequencies are not even really a good representation of the actual EM frequencies they are detecting, just a crude model with genetic survival value.

Our senses detect VERY LITTLE of what COULD be detected with adequate sensors (but our technology helps us with that). And even then, our perceptual filters discard the vast majority of what our senses DO detect from the firehose of sensation (unless you are autistic), to prevent us from being overwhelmed.

And of course, how those filters work is VERY DIFFERENT for NeuroTypical ("normal") people and aspies. NTs (NeuroTypicals) have very fast and power-efficient (but slow to adapt) hardwired social-perceptual filters, which work well even when tired or hungry, and can also detect subtle social cueing. ASD (Autistic Spectrum Disorder) people have reduced or absent hardwiring in this area, and MUST have very high intellect so they can simulate this function consciously (i.e. in "software"), or they will end up being overwhelmed by too much sensation (autistic). Because this type of social-perceptual filter is not the normally hardwired filter acquired genetically and during initial primary language acquisition, it must be learned by a child (i.e. self-programmed) if he is to acquire any social skills at all. Though such a "softwired" filter is slower and more power hungry than a hardwired filter, it does not work well when tired, hungry, or when annoyed by pain (vastly extra sensation in this condition) or by bullies. However, such a "software" filter can allow an aspie to be aware of so much more or can tune to a laserbeam focus and exclude all else for long periods of time. A beneficial side-effect is the ability to easily solve "impossible" problems quickly and easily (when they grab his attention), and these filters can adapt to rapid environmental and technological change (as in the oncoming technological singularity). Such folks have always existed but technology is driving such people together so that each generation has many more aspie geeks, who themselves push technology forward (toward the technologicla singularity). We are the outliers of society who, though too often shunned and abused, actually protect the tribe by warning them of external danger, and where and when the buffalo roam. And in the future, aspies may be the only ones who can adapt quickly enough to communicate with and understand our AI overlords of the future.

And while discussing visual perception and how our simulation of reality is not even a particularly accurate representation of the tiny portion of the electromagnetic and pressure spectrums, this Ted Talk is a "must see":

And this explains why we can mix a handful of pigments (or RGB display subpixels) to simulate the color of any particular visible monochromatic LED or laser.

And this also brings an end to another "little professor" lecture. (Click the link.)

But lets end this post with a very short and humorous little video (though all these videos are worth watching in their entirety, especially Donald Hoffman's Ted Talk):

[knc1]

Originally Posted by Cinisajoy

Not that interested, though the differences sure came in handy when we were sorting floss from kits.
A few years back, we picked up a pickup load of cross stitch stuff for $20.

You have both adapted by now.

And in that adaption, probably learned not to get into any:
"Does this red belt really match my red shoes?" sort of discussion.

[geekmaster]

And now, back to our original topic. My dead batteries are blue (from a PW3) and white (from a K3), as can be seen earlier in this thread. I need to take the screws out of my PW2 and/or PW3 and test my modified blue battery in them.

[geekmaster]

Originally Posted by pdurrant

[...] *There are people who don't have the detectors for all three colours, giving rise the various kinds of colour-blindness. Interestingly, there are some people who have four different colour detectors, as there are variants in the genes for the red and green receptors. In at least one person, this has been shown to give enhanced colour vision.

Originally Posted by knc1

You have both adapted by now.

And in that adaption, probably learned not to get into any:
"Does this red belt really match my red shoes?" sort of discussion.

Though there are special glasses available now to CORRECT color blindness, by filtering out (masking) nearby colors that normally prevent perceiving the missing colors. With these new glasses, color-blind people can see colors they never saw before. It is such a life-changing event it often makes people cry when they put on these glasses for the first time.

http://enchroma.com/

Now, that makes me anxious for some tetrachromatic folks (those with four color dimensions) to create "colorblind correction" glasses for those of us "color-impaired" (vast majority of us) folks who can only see the three overlapping R/G/B color bands. Though perhaps we do not have impaired sensation, just absent, in which case we will need to wait for direct-neural stimulation to supply such missing or extra perception. We will be cyborg then.

[geekmaster]

Originally Posted by geekmaster

And now, back to our original topic. My dead batteries are blue (from a PW3) and white (from a K3), as can be seen earlier in this thread. I need to take the screws out of my PW2 and/or PW3 and test my modified blue battery in them.

Okay, front skin off my PW2. Looking for jewellers screwdriver...

BTW, I do not mind this "mult-threaded" thread. I LOVE such divergent things, like the many paths to explore in a maze or a cave system. Or like the constant "multitasking" channel flipping in the rare occasions we find ourselves in front of a TV with a remote in our hands (until somebody takes it away). I like following all those little snippets from multiple TV channel threads and "re-creating" the missing pieces of them all. There is always either NOTHING of interest on (almost always) or interesting things on multiple channels at the same time. Best avoided in both cases...

Oh yeah, screwdriver... Look! A squirrel!



Found it! (Screwdriver, not squirrel). Now, the modified battery is not where I thought it might be. Or the "other place" either. Out of sight, out of mind. Why do we have to put all my stuff away when we are getting visitors? "Put away" is usually just "gone". Like those TTL serial adapters I need to serial jailbreak my PW3. Yeah, an aspie thing. I clearly remember exactly where I last used each part or tool. If they were just left there, I would find them quickly. Put away, gone. Even with my many hundreds of "organized" parts bins. Putting similar things together just means they are all lost together. Distributing screwdrivers in 16 different locations means I will find one 16 times faster. Fact of life. That "place for everything and everything in its place" social rule never works -- every time I re-invent every possible place I can think of in my current context, none of them are that place. I usually find the missing tool the day after I buy a replacement -- I think that is one of Murphy's Laws. Ah yes, conclusion #8, here...

[Cinisajoy]

I understand the screwdriver thing.
But then again if someone doesn't like the toolbox, they are more than welcome not to visit again.
Oh and the jeweler's screwdriver is on the second shelf of the desk.

[geekmaster]

PW2 screws out, back cover removed, battery out. Oops! Screws mixed together, some silver and some black. Other than color, they all look the same. Does it matter which go where?

Now, where is that modified battery? Time for another hunt...