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-.Dd September 17, 2018
-.Dt PNGO 1
-.Os
-.
-.Sh NAME
-.Nm pngo
-.Nd PNG optimizer
-.
-.Sh SYNOPSIS
-.Nm
-.Op Fl cv
-.Op Fl o Ar file
-.Op Ar
-.
-.Sh DESCRIPTION
-.Nm
-optimizes PNG files for size.
-.
-.Pp
-The arguments are as follows:
-.Bl -tag -width Ds
-.It Fl c
-Write to standard output.
-.It Fl o Ar file
-Write to
-.Ar file .
-.It Fl v
-Output PNG header information.
-.El
-.
-.Pp
-.Nm
-performs the following optimizations:
-.Bl -bullet
-.It
-Discard ancillary chunks.
-.It
-Discard unnecessary alpha channel.
-.It
-Convert unnecessary truecolor to grayscale.
-.It
-Palletize color and alpha if possible.
-.It
-Reduce bit depth if possible.
-.It
-Apply a simple filter heuristic.
-.It
-Apply zlib's best compresion.
-.El
-.
-.Sh SEE ALSO
-.Xr glitch 1
-.
-.Sh CAVEATS
-.Nm
-does not support interlaced PNGs.