Thank you for making the same point repeatedly. Saying it over and over doesn't make your observation more clear. If you think there's some perfectly quantifiable count of all the colors which is well known, then you are a victim of the very ignorance you are claiming to dispell. You're obviously a thoughful writer. So there's a gap here we have to home in on. There's some unspoken presupposition to your belabored point which I am seeking to uncover. But it would be easier if you do it yourself You've laid out your premise that if you discount dE below some threshold that the map of perception can rely on far fewer values than cinventional RGB But this overlooks that RGB is not a perceptually optimized format. Moreover, as the visual system is a comparator, not an accumulator, you've rhetorically hoisted yourself on your own petard by suggesting that color is countable at all. To count it requires a model, which relies on assumptions many of which are well known to be variable, but which are simplified with useful approximations. I paraphrase your point 'don't forget how subjective color is to the model for our understanding' then you go on to argue 'there's a definitive reality to color and the CIE shows it's this many' (insert count of dE delimited values over spectrum locus' That's going in circles... What is your larger point? On Mon, Jan 6, 2020 at 14:33 Andrew Rodney <andrew@digitaldog.net> wrote:
On Jan 6, 2020, at 3:22 PM, Wire ~ via colorsync-users < colorsync-users@lists.apple.com> wrote:
Is the point is to proffer awareness that RGB coding is far from perceptually uniform?
Nope.
Ya it's exactly this attribute that necessitates the extra bits.
You still need to tie bits (numbers) and colors into understanding. They are not the same.
Integer RGB is a mechanical space. Pull a bit lever and cause a stimulus change from the device.
You're making this far more confusing then you need to.
It so happens—as Florian points out—that synthetic single channel data—the kind that test charts are made of—exposes a weakness in the coding that ultimately is overcome by adding channel bits. This over-provisions other parts of the space. OK. So...? What do you think this says about the format and future directions of tech?
Off topic,
As to this parsing about actual colors, consider an experiment where you take your palette of 200k distinct colors in RGB and uniformly add/subtract some small number to their values with results within the 16 million range of the space then place this adjusted set side-by-side with the original and see if you can discern the difference? If you can, what would this say about the necessity of the bigger range?
You're making this far more confusing than you need to. Numbers can be colors, numbers may not be colors. Colors are visible. Some numbers are not. Simple. There are not 1 billion colors. There are 1 billion numbers. Understand?
Andrew Rodney http://www.digitaldog.net/
On Mon, Jan 6, 2020 at 13:36 Roger Breton via colorsync-users < colorsync-users@lists.apple.com> wrote:
Well, Andrew, just to push the discussion further, I would *love* to hear what Steve Upton would have to say about “unique colors” since he’s the one that wrote the application: what numerical criteria does Steve use in ColorThink to distinguish among “unique colors”?
In the meantime, I’m willing to buy 208,486 😊
/ Roger
From: Andrew Rodney <andrew@digitaldog.net> Sent: Monday, January 6, 2020 4:31 PM To: <graxx@videotron.ca> <graxx@videotron.ca>; Andrew Rodney via colorsync-users <colorsync-users@lists.apple.com> Subject: Re: 1 billion colors
Got a copy of ColorThink Pro?
Take the TIFF, load it into that product, Extract all unique color values into a color list. What do you get?
I get 208486.
Then use Convert all colors to list, what do you get?
I get 250000
You got a silly answer ("1 is missing") but there are tools to actually analyze such a document without the need to assume.....
Andrew Rodney
On Jan 6, 2020, at 1:58 PM, Roger Breton via colorsync-users < colorsync-users@lists.apple.com <mailto:colorsync-users@lists.apple.com>
wrote:
Is anyone able to discriminate between the 16.7 million colors in this 24-bit RGB image?
https://1drv.ms/u/s!AkD78CVR1NBqko8JmNRgIB2qvxz-iA?e=7il8Xk
Be honest.
/ Roger
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