Clarification on Color Management (Working Spaces and Rendering Intents)

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Originally Posted by Richard Lundberg

It's Poynter.

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It's not.

http://www.color.org/events/colorime...kshopLeeds.pdf

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Originally Posted by Richard Lundberg

It's Poynter.

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Are you sure? All the references I see refer to "Pointer", not "Poynter".

http://www.cis.rit.edu/research/mcsl2/online/cie.php

Michael R Pointer

and the good thing about this article is that it contain's an Excel spreadsheet of Pointer's data. There are also some other interesting datasets.

I've not played yet! :)

Hunting around a bit the Munsell website appears 'old' and THIS seems to be the 'new' version.

This link is more interesting and also mentions what may happen in the future - more colours than just RGB in the pixels. The information on pointers is interesting too - matt surfaces.

http://www.tftcentral.co.uk/articles/pointers_gamut.htm

Now that smallish 4k panels are available and the fact that 100dpi has proved to be ok it seems they currently may be able to add 1 or 2 more colours. This doesn't fit in with HD TV though and more pixels always attracts the public even on cameras. :D Maybe one day just like on some current bridge cameras they may say here's one with less effective pixels but much better colours. Trouble is there seems to be no signs of anybody being interested in really biting the bullet and hitting the real problem on the head. Pretty common in the development world as it can leave no where else to go - bad news.

John
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This article, which mentions Pointer's Gamut in passing, has considerably dampened my enthusiasm for wide (Rec. 2020) gamut monitors :(

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Kane (Joe Kane Productions) sees two problems with the Rec. 2020 colorimetry standard. (Note: no current UHD TV or home theater projector has a Rec. 2020 color gamut.) First, it is still a limited color gamut and cannot produce all colors people would like to put into content. This is true even though the Rec. 2020 color gamut is, in fact, larger than the digital cinema color gamut.

The other problem Kane pointed out is that it is not realistic now or in the future to actually build a display with Rec. 2020 primary colors. The only way these primary colors can be created is with lasers, and narrow band lasers at that. This, of course, will lead to speckle and, in home theater projectors, laser safety issues. Cost may be an issue as well. More importantly, from Kane’s point of view, was the issue of viewer-dependent metameric color problems. This metameric color problem will lead different viewers to see different colors on the screen. This problem could be particularly severe on desaturated colors, for example, flesh tones. The narrower the bandwidth of a primary color, the more severe the problem with metameric colors. And, the ultimate in narrow-band is narrow band lasers so the problem can be expected to be much more severe than it is with primaries based on phosphor emission.

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http://www.display-central.com/free-...hd-tv-systems/

"all is not gold that glisters"

If the bloke is correct Ted. As a for instance take a look at this one. You'll have to download the pdf to see the spectral output.

http://uk.farnell.com/ledengin/lz4-0...-75/dp/2080127

I thought I was on their web page but this one will do. There are also other colours available. He is sort of saying that the manufacturers can't produce what would be needed. I find that rather doubtful. I also think that the chances of all photo/visual things standardising on the same gamut as being unlikely. It might even involve everybody buying new cameras.

John
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Originally Posted by ajohnw

If the bloke is correct Ted. As a for instance take a look at this one. You'll have to download the pdf to see the spectral output.

http://uk.farnell.com/ledengin/lz4-0...-75/dp/2080127

He is sort of saying that the manufacturers can't produce what would be needed. I find that rather doubtful. I also think that the chances of all photo/visual things standardising on the same gamut as being unlikely. It might even involve everybody buying new cameras.

John
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Took me back in time, that. Used to specify some Farnell stuff as a gas turbine Controls Engineer, '70s & '80s.

The LED falls a bit short of the Rec.2020 primaries (except blue) but the spectral emissions look pretty good, not laser-ish. I see that it has an amber emission in addition to RGB . . .

Thanks for the link

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Originally Posted by GrumpyDiver

Are you sure? All the references I see refer to "Pointer", not "Poynter".

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ok, brain fart. Was thinking of the Poynting vector.

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Originally Posted by xpatUSA

Took me back in time, that. Used to specify some Farnell stuff as a gas turbine Controls Engineer, '70s & '80s.

The LED falls a bit short of the Rec.2020 primaries (except blue) but the spectral emissions look pretty good, not laser-ish. I see that it has an amber emission in addition to RGB . . .

Thanks for the link

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The amber is there to improve the colour rendition of what ever it's lighting up. The usual RGB falls short on some colours and probably materials. They have done others with 2 greens. Not looked on their site for a few years so not sure what they have available now.

John
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