disables panning on the according axis. You typically have to set the screen
size with \fI--fb\fP simultaneously.
.IP "\-\-transform \fIa\fP,\fIb\fP,\fIc\fP,\fId\fP,\fIe\fP,\fIf\fP,\fIg\fP,\fIh\fP,\fIi\fP"
-Specifies a transformation matrix to apply on the output. Automatically a bilinear filter is selected.
+Specifies a transformation matrix to apply on the output.
+A bilinear filter is selected automatically unless the \-\-filter parameter is
+also specified.
The mathematical form corresponds to:
.RS
.RS
passing a matrix, one can pass the string \fInone\fP, in which case the default
values are used (a unit matrix without filter).
.RE
+.IP "\-\-filter \fIfiltermode\fP"
+Chooses the scaling filter method to be applied when the screen is scaled or
+transformed.
+Can be either 'bilinear' or 'nearest'.
.IP "\-\-scale \fIx\fPx\fIy\fP"
Changes the dimensions of the output picture. Values superior to 1 will lead to
a compressed screen (screen dimension bigger than the dimension of the output