Color picking options

to get the rgb/hex values of a pixel?

If you are looking for HEX values, I assume this is for Web/HTML work, so sRGB?

Apple’s Digital Color Meter set to Display in sRGB seems to match Photoshop’s sRGB values. Here my Photoshop Working RGB Space is set to sRGB, so with no document’s open the PS Color Picker RGB values are sRGB. Everything I try matches, here are 2 random samples with matching values:

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@drstir wrote:

I'd also be grateful for any advice on how I'd go about it in Photoshop. Last time I just opened a screengrab, and used the picker tool. But that's a bit long-winded. I'm sure there used to be a tool within Adobe that did it. But I can't find it anywhere.

 

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Make a screen grab. 

ASSIGN  your display profile!

Open in PhotoShop; again, you must. 

Sample value as outlined below. 

Do you mean something other than the Eyedropper Tool?

https://helpx.adobe.com/photoshop/using/tool-techniques/eyedropper-tool.html

The Info panel shows a First Color Readout and a Second Color Readout.  They default to RGB and CMYK, but you can go into the Panel Options and change that.  You might want RGB and Web Color.  This will display the pixel color values as you hover in the Info panel.

I mean what are you trying to do first?

If you are trying to pull Coca-Cola red from a photo... then forget it.  You need to find the hex color online. 

That is just an example.

Or are you just trying to find a nice color selection? If so then use Adobe Capture with the image on your phone.

Let us know and then we can give you some ideas.