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3.6.2 Crop
This image filter removes the white margins around images. The dimensions of the white margins to
remain at the top, bottom, left and right can be set separately. Furthermore, by selecting the
Force
Symmetry
check box, the same dimensions can be left at the top, bottom, left and right.
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Note
The Cropping image filter does not work properly when there is black noise in the margins of the
images. To correct this, specify the Noise Removal image filter before specifying the cropping image
filter (refer to
“3.6.9 Noise Removal” on page 43
).
3.6.3 Dilation
This image filter enlarges the black areas. When it is used, the image quality and legibility of the text are
improved.
Property
Description
Number of
passes
Input the number of times the Dilate image filter is to be applied. When this number is
increased, the text and patterns appear thicker. Normally, a setting of “1” is sufficient.
Diagonal
The four pixels on the diagonals around the black pixel in the center are replaced with
black.
Horizontal
The two pixels at the left and right of the black pixel in the center are replaced with
black.
Vertical
The two pixels at the top and bottom of the black pixel in the center are replaced with
black.
Table 11: Dilation Properties and Descriptions
