.Dd $Mdocdate$
.Dt GLITCH 1
.Os "Causal Agency"
.Sh NAME
.Nm glitch
.Nd PNG glitcher
.Sh SYNOPSIS
.Nm
.Op Fl cfimprxy
.Op Fl a Ar filters
.Op Fl d Ar filters
.Op Fl o Ar file
.Op Ar file
.Sh DESCRIPTION
.Nm
misinterprets PNG files
according to the options given
to create natural glitch effects.
.Pp
The arguments are as follows:
.Bl -tag -width Ds
.It Fl a Ar filters
Apply a pattern of comma-separated filters.
Filters are
.Cm none ,
.Cm sub ,
.Cm up ,
.Cm average ,
.Cm paeth .
.It Fl c
Write to standard output.
.It Fl d Ar filters
Declare a pattern of comma-separated filters.
See
.Fl a
for list of filters.
.It Fl f
Apply filtering in place of reconstruction.
.It Fl i
Invert image data after filtering.
.It Fl m
Mirror scanlines after filtering.
.It Fl o Ar file
Write to
.Ar file .
.It Fl p
Use a broken Paeth predictor function.
.It Fl r
Apply reconstruction in place of filtering.
.It Fl x
Zero first pixel of each scanline after filtering.
.It Fl y
Zero first scanline after filtering.
.El
.Sh EXAMPLES
.Bd -literal
glitch -m -a sub -d sub
.Ed
.Sh SEE ALSO
.Xr pngo 1
.Sh BUGS
More wanted.