Chapter 7: Blue-White Picking Processes
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To select the colonies for picking:
1. From the list in the upper-right area, select the barcode or identifier of the receptacle to
view.
2. Refine the colony Selection criteria.
Compactness sets the level of irregularity for picking colonies. The value is a ratio of
the perimeter divided by the area of the colony, so that irregular shaped colonies are
closer to 0 and colonies that are more of a perfect circle are closer to 1. A colony equal
to or less than 0.65 is not picked by default.
Axis Ratio measures how oval the colony is. The value is a ratio of the longest diameter
divided by the shortest diameter, so oval shaped colonies is closer to 0 and round
colonies is closer to 1. A colony equal to or less than 0.65 is not picked by default.
Min Diameter (mm) sets the minimum diameter of colonies for picking. A colony equal
to or less than the value in this field is not picked.
Note: The Min Diameter (mm) cannot be lower than the Diameter value set in the
Debris Discard section of the test image.
Max Diameter (mm) sets the maximum diameter of colonies for picking. A colony equal
to or greater than the value in this field is not picked.
Min Proximity (mm) sets the distance between colonies to be picked, so that when
picking one colony, a different adjacent colony is not picked. The system default value
is 0.45 mm.
3. For a fluorescent image, adjust the Intensity Measure as shown in the histogram. This
option is available only for instruments with a fluorescence imaging module.
Mean Intensity is the average fluorescence of the detected colony (the fluorescence of
all the pixels within the colony perimeter divided by the number of pixels within the
colony perimeter).
Median Intensity is the middle fluorescence value of all the pixels within the detected
colony perimeter.
Geometric Intensity is the geometric intensity of the detected colony or the
fluorescence of all the pixels within the colony perimeter.
Centre Mean Intensity is the average fluorescence value of the middle 9 pixels within
the detected colony perimeter.
Select Greater Than, Less Than, or Between and enter a value in the field to define the
fluorescence intensity threshold. For Between, enter two values to define the range.
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