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 http://www.digitaldog.net/ 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 _______________________________________________ Do not post admin requests to the list. They will be ignored. colorsync-users mailing list (colorsync-users@lists.apple.com <mailto:colorsync-users@lists.apple.com> ) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/colorsync-users/andrew%40digitaldog.... This email sent to andrew@digitaldog.net <mailto:andrew@digitaldog.net>