CentOS 7.0 - man page for pngnq (centos section 1)

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PNGNQ(1)				   User Manuals 				 PNGNQ(1)

NAME
       pngnq - quantize png images

SYNOPSIS
       pngnq  [-vfhV][-s sample_factor ][-Q dither ][-g gamma ][-e extension ][-d dir ][-n colors
       ][ inputfiles ]

DESCRIPTION
       pngnq Quantizes a 32-bit RGBA PNG image to an 8 bit RGBA palette PNG  using  the  neuquant
       algorithm. The output file name is the input file name extended with "-nq8.png" or a spec-
       ified extension.

OPTIONS
       -v     Verbose mode. Prints status messages.

       -f     Force ovewriting of files.

       -s sample factor
	      Sample factor. The neuquant algorithm samples pixels stepping by this  value.   The
	      default  value of 3 gives good results. Higher values sample less of the image pix-
	      els and thus are faster but less accurate. A factor of 1 samples every image pixel.

       -n colors
	      Specifies the number of colors to quantize to. Defaults to 256 which is  the  maxi-
	      mum.  The minimum here is 2.

       -Q dither
	      Choose a dithering method: n = no dither (default), f = Floyd Steinberg dithering.

       -g gamma
	      Set  the	image  gamma  correction.  If  not  present, uses the png file's gamma or
	      defaults to 1.0.

       -e extension
	      Specifies the new filename extension. Defaults to  "-nq8.png".   Pngnq  drops  .png
	      from  the  original filenames. If you set the argument of the -e option to .png and
	      choose the -f option the input file will be overwritten.

       -d dir Tells pngnq to put output files in a directory other than the one the  input  files
	      are in.

       input files
	      The  png	files  to  be processed. Defaults to standard input if not specified.  If
	      standard input is being processed the output is sent to standard output.

       -h     Print program help.

       -V     Print version number and library versions.

BUGS
       Does not deal correctly with greyscale alpha images with low bit depths,  but  these  wont
       benefit from quantizing.

AUTHOR
       Stuart Coyle <stuart.coyle@gmail.com>

SEE ALSO
       png(5)

Linux					     MAY 2009					 PNGNQ(1)
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