>> What does that tool do?
> This has come directly to me so I assume you only copied it to the list.
> That means the list will not see my reply.
> I will quote what I see in a book I have:- "With the Color Sampler tool
> active, clicking in your image attaches up to four samplers. These four
> Color Samplers can be used to measure and track shadows, mid tones,
> highlights and a fourth tone of your choice. While you are actively
> adjusting tonal values the color samplers provide a before and after
> readout in the Info palette."
> It seems to be a bit like the Eyedropper but more so.
That's what the Reply to All button in your mail client is for.
The Sample Points should give roughly what you want:
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