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Where to Find the Colors Your Screen Can't Show You

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Re: Where to Find the Colors Your Screen Can't Show You

#131

Post by account42 »

ComputerGuru wrote: post #72
szmarczak wrote: post #46

Earlier quoted context omitted.

There's color space and there's color depth. You may be using D-P3 with 8 bit, which is worse (less accurate?) than sRGB with 8 bit. And there's bandwidth. Your monitor may not be able to handle 4k 240fps 16 bit.

These days cheaper monitors with only 8bpc support advertising higher color support use FRC to flicker between different 8-bit colors at a high enough rate to trick the vision receptors to seeing a mix between the two. Separately, sorry to nitpick, but while wide gamut colors with only eight bits of data have lower resolution than sRGB, that doesn’t make them an inferior option. You might not be able to specify the e…

> Separately, sorry to nitpick, but while wide gamut colors with only eight bits of data have lower resolution than sRGB, that doesn’t make them an inferior option. You might not be able to specify the exact shade but a) your effective accuracy is still greater and b) you trade that for greater range.

The problem is that you almost never are showing a single solid color and in the real world it matters much more how wrong your colors are compared to the ones displayed next to than it does how wrong they are compared to some far away reference. Banding is VERY noticeable and would be even more so if camera sensors didn't have noise.

Re: Where to Find the Colors Your Screen Can't Show You

#132

Post by lambdaone »

ComputerGuru wrote: post #73
Aurornis wrote: post #64

Earlier quoted context omitted.

> Your monitor may not be able to handle 4k 240fps 16 bit. 10 bits per channel is the common target for higher color depth. The formats with 16 bits per channel are generally for image storage and allowing more bits for downstream transforms to avoid quantization. I don’t even know if there are video cards that would output 16 bits per channel, let alone panels for it.

I don’t think 16 bpc is supported in the standard consumer workflow but I believe 12 bpc is?

12-bit log is a very common format in professional post-production.

Re: Where to Find the Colors Your Screen Can't Show You

#133

Post by blincoln »

fortran77 wrote: post #62

I'm having an amazing time seeing colors now because I just had cataract surgery on my right eye (left eye next month) and have a clear lens again. If I compare my new right eye to my old left eye, I'm seeing colors I haven't seen in decades. Skies look blue with my right eye, gray with my left. It's odd he noted Apple monitiers were "better". Maybe but marginally. Many options for other platforms, like Asus Pro Arte…

If you haven't already, you should do some tests to see if you can see UV-A now. Some replacement lenses are UV-transparent.

Dandelions in sunlight are an easy option, at least in my part of the world. If your replacement lens is UV-transparent, dandelions should have a very distinct colour difference between the center and outer parts of the petals, instead of a mostly-uniform yellow.

Re: Where to Find the Colors Your Screen Can't Show You

#134

Post by blincoln »

zahlman wrote: post #91
mceachen wrote: post #86

Earlier quoted context omitted.

More than 3 channel displays have been attempted by several companies, but I suspect they fail due to: 1) trying to convince content makers to use new custom high-gamut hardware to capture the new spot colors 2) you'd need a full video content production pipeline that can render to that color space 3) finding enough people to care enough to pay the (substantial) premium for niche production numbers. 4) Most content j…

5) You'd need image formats that record those channels, and that in turn would cause problems for raw bitmaps with alpha (they either get twice as big or the pixels are no longer aligned).

AFAIK TIFF supports an arbitrary number of additional channels already.

Re: Where to Find the Colors Your Screen Can't Show You

#135

Post by blincoln »

adrian_b wrote: post #21

While it is true that some saturated blue-green colors will never be reproducible with only 3 primary colors, the CIE 1931 chromaticity diagram used in TFA overemphasizes their importance, because human vision cannot distinguish many colors in that area of the diagram. In reality, the greatest defect of the sRGB color space, which is still too frequently the default color space, is that it is not able to reproduce ma…

> The missing orange-red-purple corner appears small in the diagram in comparison with the missing blue-green corner, but in reality humans perceive much more different colors in the orange/red/purple corner, so the relation between those areas would be opposite in a uniform color space.

Do you know if this is why looking through a true green-blocking (pure magenta or purple) filter (e.g. Wratten 32, 33, or 34A) is such a different experience than a digital photo taken using the same filter?

Looking through those filters is extremely surreal for me, but I've not been able to capture anything like it with any camera.

Re: Where to Find the Colors Your Screen Can't Show You

#136

Post by kowbell »

card_zero wrote: post #42

My debatable factoid is that all vision is movement-dependent, including human vision, and so the bigness and wonderfulness of the tyrannosaur's eyes is beside the point of whether it needed its prey to move around in order to perceive it. https://en.wikipedia.org/wiki/Stabilized_images , https://en.wikipedia.org/wiki/Fixation_(visual) , https://en.wikipedia.org/wiki/Microsaccade We fake the movement of anything we'r…

These are really interesting.

I've noticed when I'm spacing out and staring at a single point for a while that there's some kind of "tunnel vision" that develops, where everything besides the small point I'm looking at starts to darken and if I shift my body suddenly everything that was fading will "refresh." I always thought it felt similar to when a particularly bright light "burns in" your vision for a moment. Sounds a lot like the phenomenon described in the Stabilized Image article. Neat stuff!

Re: Where to Find the Colors Your Screen Can't Show You

#137

Post by wlonkly »

fmajid wrote: post #127
wlonkly wrote: post #121

Earlier quoted context omitted.

"C-800 Spectromaster" is exactly how specialized devices like that should be named.

It does sound a bit like the Boeing C-17 Globemaster III my uncle worked on...

Only 17? This one's 783 better!

Re: Where to Find the Colors Your Screen Can't Show You

#138

Post by throw0101a »

fmajid wrote: post #111
NooneAtAll3 wrote: post #74

Earlier quoted context omitted.

what's the alternative metric to look for as a consumer?

Few bulb manufacturers even bother to report CRI, unless it is decent (CRI > 90). If CRI is not reported, you can be sure it's bad, 80 or less. Unfortunately, there isn't really a way for a consumer to know short of buying a spectrometer like my Sekonic C-800 Spectromaster. For illustration, I have uploaded a few readings here, mostly flashlights, not LED bulbs: https://majid.info/images/reddit/spectro/ If you look a…

Sekonic video on the C-800 (and the standards it can measure CRI, etc):

* https://www.youtube.com/watch?v=_oXqWlUuSNA

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