Hello,
I add to the curves improvement.
On PS, CO or LR you have different curves tools that shows a point or vertical line, over the curve or the histogram, while you are pointing your cursor over the image.
This way you can check different areas of your image and see the tone, to check if it's too light or too dark, or if it is into the 'correct' zone.
Lightroom have a tone curve tool where you can see the tone in % and before/after values; you can see a point on the curve without needing to edit the curve or place adjusting points.
In Capture One you can see a line on all the histogram tools (histogram, leves and curves) while you move over the image.
In PS, curves tool, while you press the left mouse button and move over the image, you can see the tone as a point that moves over the curve, before need to edit the curve.
But on AP, to see the tone of an area of the image, you need to click the picker button, then locate your area, drag a bit there, place a point on the curve, then after that you can see the tone of that area.
It would be really useful to see the tones of the image using the curves tools... or any other tool.
I use the LR tone curve tool to check tones on different areas of the image (light and shadows on faces, for example).
It happened me several times, when I end to edit a picture and send it for print, that the tones of the printing were a bit different compared to what I 'saw' on my monitor. The colors are ok, but I see darker tones near black and some light tones just pure wait on print. So now I check my pics with the tone curve tool before sending for printing, cheking if important areas are below 5% or above 90%, also if faces are into razonable values, so no matter if the bright of my monitor is not 100% correct, I check the real tones this way. This tool is really invaluable.
Regards.