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+.Dd September 21, 2021
+.Dt PNGO 1
+.Os
+.
+.Sh NAME
+.Nm pngo
+.Nd PNG optimizer
+.
+.Sh SYNOPSIS
+.Nm
+.Op Fl acgv
+.Op Fl b Ar depth
+.Op Fl o Ar file
+.Op Ar
+.
+.Sh DESCRIPTION
+.Nm
+optimizes PNG files for size
+by performing the following:
+.Pp
+.Bl -enum -compact
+.It
+Discard ancillary chunks.
+.It
+Discard unnecessary alpha channel.
+.It
+Convert unnecessary truecolor to grayscale.
+.It
+Palletize color if possible.
+.It
+Reduce unnecessary bit depth.
+.It
+Apply a simple filter type heuristic.
+.It
+Apply zlib's best compression.
+.El
+.
+.Pp
+The arguments are as follows:
+.Bl -tag -width Ds
+.It Fl a
+Always discard the alpha channel.
+.It Fl b Ar depth
+Reduce bit depth to
+.Ar depth
+or lower.
+.It Fl c
+Write to standard output.
+.It Fl g
+Convert to grayscale.
+.It Fl o Ar file
+Write to
+.Ar file .
+.It Fl v
+Print header information and sizes
+to standard error.
+.El
+.
+.Sh SEE ALSO
+.Xr glitch 1
+.
+.Sh BUGS
+.Nm
+does not support interlaced PNGs.