QPix 450 or QPix 460 Colony Picking System User Guide
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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 detect 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 then enter a value to define the
fluorescence intensity threshold. For Between, enter two values to define the range.
4. Change the pickable property of individual objects.
To define an object as pickable, right click the object and select Pick Item to display the
object in green.
To define an object as unpickable, right click the object and select Discard Item to
display the object in blue.
5. In the Limit Colonies field, enter the maximum number of colonies to pick from each region.
If a limit was previously set for the maximum number of colonies in the Destination/Source
Options window, the Limit Colonies option is not available in the Feature Selection window.
See
Setting Source Receptacle Options on page 64
.
The Total Feature Count field displays the total number of pickable objects.
6. Select the Feature Counts tab to view the number of found features in the regions of the
source receptacle configured in columns.
The Well column identifies the region of the source receptacle.
The Found column gives the number of colonies found in that region.
The Pickable column gives the number of pickable colonies in that region, based on
the selection criteria.
The Picking column gives the number of colonies that are to be picked in that region,
based on the selection criteria
To save the data in .csv format, right-click and then click Export.
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