The Options dialog box offers several preferences that apply to interactive measurement functions. In the Tools > Options > Measurement > Results dialog box, you specify how the measurement results are to be output. The settings are valid for the display of the measurement values on the image and the measurement display in the Measurement tool window.
Description of the function groups
Options of the Measurement tool window
Display
Default number of decimal places
From the Default decimal places list, you can choose the maximum number of decimal places that are to be used when the measurement results are written. The decimal places shown will be rounded off.
Note: The number of decimal places does not depend upon the measurement precision. The precision of the measurement depends solely on the X/Y calibration data. If a pixel is 0.1 µm wide and high, then 0.1 µm is the smallest distance that can be measured.
Prefix of the units
Set the units in which the measurement results are to be exported in the Prefix of the unit list. Select, for example the option "µ" from the list, to have all of the measured lengths written in "µm" units and all of the areas in "µm²" units.
Select the entry [ - ], from the list, to choose the basic unit in each case, for example Meter (m), for the length measurement.
Select the Image Calibration entry from the list, to have the unit to be used read out of the image's calibration data. In this case, the unit that was used for the X/Y-calibration will be selected.
Select the Auto option from the list, to have the unit to be used for the measurement value automatically chosen. The unit will then be chosen so that the value for the length measurement lies between 1 and 999. A reference distance of 1700 µm will in that way appear in the results sheet as 1.7 mm.
Values for area measurements lie between 1 and 999999.
When you choose this option, measurement values with different units can appear in the results sheet.
Options of the Measurement tool window
Numbering measurements serially
All of the values that have been measured will be listed in the Measurement tool window. Select the Show column 'ID' check box to have the measurement values numbered serially in the Measurement tool window. When this check box has been selected, the ID column containing the current number of the measurement value will be automatically added to the display in the tool window.
The numbering always relates to a single image.
Each measurement object keeps its measurement ID once it has been assigned. For example, if there are three measured objects on the image and you delete the measurement object with ID 2, the image will still contain the two measurement objects 1 and 3.
You can also show the measurement ID in the image. To do so, select the Show ID check box located in the Options > Measurement > Measurement Display dialog box.
Displaying measurements per image
Select the Only for the active image check box to have only the measurement values that have been measured on the current image shown in the Measurement tool window.
Clear this check box if you want to carry out a measurement on several images. Then all of the values that have up till then been measured will be shown in the Measurement tool window. Use the Document measurement parameter to have the image name specified for every measurement value. By doing this, you can unambiguously assign every measurement value to an image. You can read how to output different measurement parameters here.
Then, click, e.g. on the Export to Excel 
button, to have all of the values that have up till then been measured, issued in one single sheet.
Displaying measurements per image layer
Select the Only of the active layer check box to have only the measurement values that have been measured on the current image layer shown in the Measurement tool window.
This setting is only relevant when you are measuring a multi-layer image. Use the Layers tool window to view the number of image layers, and to set the active image layer.
Clear the check box to have all of the values that have up till now been measured, displayed in the Measurement tool window. Use the Layers measurement parameter to have, for every measurement value, the name of the image layer on which it was measured, specified. You can read how to output different measurement parameters here.
Statistics
Statistical evaluations can be calculated for each selected measurement parameter. The statistical values will be shown in the lower part of the Measurement and ROI tool window.
Possible statistical values
You can choose the following statistical values:
Count: number of the individual measurements
Minimum: lowest measured value
Maximum: highest measured value
Mean: mean value of all of the measured values
Standard deviation: The standard deviation is a measure for the spread of the measurement values around their mean value.
Sum: the sum of all of the measurement values
Hiding statistical values
If you don't want to calculate any statistics, clear all of the check boxes. The Measurement tool window will then contain only the measurement values.
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