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The Eyedropper tool has a cousin called the Color Sampler tool, and you use this to set targets in your document where you want to pay attention to those particular values at that point that you click. So I just clicked with the Color Sampler tool to put a color sampler target and you can see that's marked here in the Info panel now, number one, it tells me what those values are. So if I go on to do something like a Curves or levels adjustment, having that area marked will give me the before and after for that particular change in that specific region. You can have up to four of these. So if I just click four other spots, I get four specific target readouts and the Info panel grows.
To delete a Color Sampler, just hold down the Option key or the Alt key and hover over the sampling. You will get a little Scissor icon where you can then delete these one at a time. Now, I should admit that I rarely actually switch to the specific Color Sampler tool because you can access that functionality when you have the Eyedropper tool selected. So I just press I for the Eyedropper and then if you Shift-click with the Eyedropper tool, that temporarily turns the Eyedropper into the Color Sampler tool. So Shift-click, and I have got those four targets again. Then if you Shift+Option-click or Shift+Alt-click with the Eyedropper tool, that gives you the ability to cut those as well.
So while there is a separate tool called the Color Sampler tool, you can get to that functionality from the Eyedropper tool just by holding down the Shift key.
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