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Comparing ray/doc/man/man1/pdfblur.1 (file contents):
Revision 1.2 by greg, Tue Dec 9 15:59:06 2003 UTC vs.
Revision 1.3 by greg, Tue Jan 18 01:37:43 2005 UTC

# Line 5 | Line 5 | pdfblur - generate views for depth-of-field blurring
5   .SH SYNOPSIS
6   .B pdfblur
7   .B aperture
8 – .B distance
8   .B nsamp
9   .B viewfile
10   .SH DESCRIPTION
# Line 14 | Line 13 | takes the given
13   .I viewfile
14   and computes
15   .I nsamp
16 < views based on a focus distance of
18 < .I distance
19 < and an aperture diameter of
16 > views based on an aperture diameter of
17   .I aperture
18 < (both in world coordinate units).
18 > (in world coordinate units) and a focal distance equal to the length of the
19 > .I \-vd
20 > view direction vector.
21   When rendered and averaged together, these views will result in
22   a picture with the specified depth of field.
23   Either
# Line 87 | Line 86 | We have found a
86   .I nsamp
87   setting somewhere between 5 and 10 to be adequate for most images.
88   Relatively larger values are appropriate for larger aperatures.
89 + .PP
90 + The
91 + .I \-pd
92 + option of
93 + .I rpict
94 + may be used instead or in combination with or instead of
95 + .I pdfblur
96 + to blur depth-of-field.
97 + If used in combination,
98 + it is best to set the
99 + .I \-pd
100 + option to the overall
101 + .I aperture
102 + divided by
103 + .I nsamp
104 + to minimize ghosting in the output.
105   .SH EXAMPLES
106   To use
107   .I pinterp

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