The Info panel provides continuous data readings using samplers. These can sample from the current position of the cursor or from a placed target position.
The type of data tracked includes:
The panel allows you to sample from under the cursor or by dragging one or more targets to the page which lets you measure color at chosen positions. The latter is useful when comparing colors before and after applying image adjustments or filters.

The following panel options are available for each sampler:
To reset the target position, drag a new target from the panel to replace the existing target.
Click to select the sampler.
The sampler will be highlighted in blue.