Filling “holes”
Ribbon: Raster– Filters> 
Hole Remover
Menu: Raster – Filters > Hole Remover…
Command line: HOLEREMOVER
This functionality is available only in the Raster module.
The filter fills small holes in raster objects. In this case, only those “holes” are filled, the size of which is less than the specified value. This filter can automatically estimate the size of holes in image objects.
The filter can be used after binarization or separation procedures to fill in unwanted holes in raster objects.
Original image
After removing “holes”
1. Select images to be processed and run the
Hole Remover command.
2. Enter the maximum size of the raster “holes” to be removed in the current units (left input field) or in points (right input field).
3. Or check the Auto estimating box to let the filter automatically estimate the size of raster “holes” before filtering.
To measure the size of the raster “hole” on the screen, click
button and specify a point inside the “hole”, or click 
button and specify two points on the screen. The program will set the “hole” size equal to the distance between the specified points.4. Click Apply
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