Color Distance Tool 
The
Color Distance Tool measures the color value difference between two
points. Click on the color distance tool and drag 'n' drop it
onto the image viewer. The values will appear. As you grab either
of the two points and move them around the values will change
accordingly.
Right-click
on one of the ends of the color distance location arrow to bring up the IPColorDistanceEntity edit box, as
seen below. Selecting the Color Distance tab allows you to select a color space, distance method and enter values for X, Y, and Z Bias.

Selecting
the Entity
tab allows you to adjust the colors, thickness, handle size,
visibility, and type of line for the color distance marker. You
can also select a
Coordinate System. Make the necessary adjustments then click
Apply and then Close. The values will be updated according to
your selections.

Selecting
the Render Style
tab allows you to adjust the colors, font, style and appearance of
the color distance value. Make the necessary
adjustments, click Apply and then Close. The style of the color distance value will be updated
according to
your selections.

Selecting the Line tab allows you to enter specific
values for the two X, Y, and Z coordinates. After entering your
values, click Apply and then Close. The distances will be recalculated and displayed
according to the values selected.
