You can use the Avg button or the Pick button to obtain the average colour of a sample of image pixels. You can sample pixels in two ways:
To sample colour values using a selection box:
The cursor changes to the colour picker.
The average colour of the sampled area appears in the Current Colour pot.
To sample colour values using the colour picker:
The cursor changes to the colour picker.
The average colour of the sampled pixels appears in the Current Colour pot.