I use this a lot for work: http://instant-eyedropper.com/
I can't watch movies/tv without this any more: https://www.svp-team.com
Probably not exactly what you were after. But they are cool tools.
Can't do it for you right now, but this is the program I'd use: http://instant-eyedropper.com/
You can put the mouse over anything on your computer's screen and it'll insert the color code onto your clipboard. :)
ColorZilla or Instant Eyedropper is what I use. There is also the Complete HTML Color Chart
Instant Eyedropper can give you the RGB colors, but doesn't put a name with them. I still like it because it's small and fast and easy to use. I can always paste the hex into Color Name & Hue if I need to. Ideally I would combine these two things to be like Colorblind Assistant, but Instant-Eyedropper isn't open-sourced.
It looks like a color-picker tool, designed to come up when you have your cursor over a color when taking the screenshot so you have the color data. I'd look into anything you might have installed that does that.
A quick Google search reveals several tools that do that, such as Instant Eyedropper.
Instant Eyedropper is my go to colour picker. It lives in the tray consuming only 1 mb RAM, just click it and pick. You can even set a shortcut. I use alt+`(the one above tab) which makes it so convenient I stopped using the built in pickers in PS/AI/XD/etc.
You have addons in sidebar, here is for buttons: https://www.reddit.com/r/naut/wiki/customcolors
here is for subscribe button:
/SIDEBAR (subscribe button colors)/ /SUBSCRIBE/.titlebox .fancy-toggle-button .active.add {background-color: #D3AE3B} /SUBSCRIBE HOVER/.titlebox .fancy-toggle-button .active.add:hover{background-color: #FFC425} /UNSUBSCRIBE/.titlebox .fancy-toggle-button .active.remove {background-color: #A91B0D} /UNSUBSCRIBE HOVER/.titlebox .fancy-toggle-button .active.remove:hover{background-color: #900603}
http://jdmcreator.byethost5.com/lab/redditgenerator/ - here you can find colour code
or you can use this program for colour code: http://instant-eyedropper.com/
I screengrab and import into Photoshop, personally. A quick Google search returned this: Instant Eyedropper Never used it, but there are quick little utilities to do it if you want that instead.