--shape-filter-level=<0-100>
The shape-filter-level option interacts with the pix-filter-level and threshold-level options to determine the balance between foreground and background. However, this parameter has very little influence over text and drawings, and we only found one example where its influence was visible: the flyer. This parameter is mostly useful to minimize the segmentation of photos and images, at very little risk for text. In this case, one should increase it from its default value of 50 to something like 75. In some very rare cases (to segment very small dots), there would be good reasons to decrease this parameter.