Configuring Backends
You can configure backends by choosing Settings Configure Backends... . Currently, configuration options are provided for EPub, , FictionBook, Txt, OpenDocument Text, and backends only.
The backends configuration dialog
The backends configuration dialog
Using backend configuration pages for EPub, FictionBook, Txt and OpenDocument Text you can define the font to render documents in the corresponding formats. The Choose... button in these pages opens standard font configuration window. Please refer to the Fundamentals documentation for the details.
The description of and backends configuration pages can be found below.

backend configuration
You can configure rendering backend based on Ghostscript by choosing Ghostscript from the list on the left part of the configuration dialog. The only configurable option is as follows.
Use platform fonts 	 This option determines whether Ghostscript should be allowed to use platform fonts, if unchecked only usage of fonts embedded in the document will be allowed. This option is checked by default.

backend configuration
You can configure rendering backend based on Poppler by choosing from the list on the left part of the configuration dialog. The only configurable option is as follows.
Enhance thin lines 	 Drawing lines in is implemented in two steps: generation of the clipping path and filling this clipping path. When the line in the original document is less than one pixel this two step implementation could cause problems. For those lines, the clipping path is filled with the filling color that depends on the thickness of the line part inside the clipping area. If the part of the line inside the clipping area gets very small the contrast between the shape and the background color can become too low for the line to be recognizable. The grids of such lines then looks very unpretty.
Thin line (red), its clipping path (dashed line) and pixel boundaries (black solid lines)	Thin line shown at a low contrast
To enhance the look of the thin lines implements two options.
The first option is Solid. With this option adjusts clipping path and line position so that clipping path and line are on the same pixel boundary, enlarges the thin lines to one pixel on the output device. This mode is similar to the Enhance thin lines in Adobe Reader. If this option is chosen, the thin lines are always enlarged.
Thin line with Solid enhancement
Thin line with Solid enhancement
The second option is Shape. With this option the clipping path and line are adjusted to pixel boundary as well, but the line intensity is corrected according to its width.
Thin line with Shape enhancement
Thin line with Shape enhancement
The thin lines are not enhanced by default (option No).