Is the point is to proffer awareness that RGB coding is far from perceptually uniform? Ya it's exactly this attribute that necessitates the extra bits. Integer RGB is a mechanical space. Pull a bit lever and cause a stimulus change from the device. 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? 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? 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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