Color Sampler Tool allows you to view color values in defined spots of your image:
In the Toolbox, select the Color Sampler Tool.
Click on the image where you want to set the first
sampler. Sampler #1 appeared in Info
palette shows the current values in your color channels.
You can set up to 4 color samplers on your
Samplers get saved in your image, so you can know color values
in defined spots even after you reopen the image.
In the Options bar, you can change sample size (sampler's
range). Point Sample reads out values from a
single pixel; 3 by 3 and 5 by 5 read average values from larger areas.
You can move samplers with Color Sampler Tool to any other spot to read color values from.
As default a sampler's readout on info palette
depends on color mode of your image (on animation - RGB); you
can however choose other readout: right-click on a color sampler
and choose in context menu other color mode.
To hide / show annotations
use [Ctrl+H] shortcut.
To delete a sample, either use context menu
(movie) or Alt-shift-click on it (mouse-click holding [Alt+Shift]