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GIF2WEBP(1)		    General Commands Manual		   GIF2WEBP(1)

NAME
       gif2webp	- Convert a GIF	image to WebP

SYNOPSIS
       gif2webp	[options] input_file.gif -o output_file.webp

DESCRIPTION
       This manual page	documents the gif2webp command.

       gif2webp	converts a GIF image to	a WebP image.

OPTIONS
       The basic options are:

       -o string
	      Specify  the  name of the	output WebP file. If omitted, gif2webp
	      will perform conversion but only report statistics.   Using  "-"
	      as output	name will direct output	to 'stdout'.

       -h, -help
	      Usage information.

       -version
	      Print the	version	number (as major.minor.revision) and exit.

       -lossy Encode the image using lossy compression.

       -mixed Mixed  compression  mode:	 optimize  compression of the image by
	      picking either lossy or  lossless	 compression  for  each	 frame
	      heuristically.

       -q float
	      Specify  the  compression	 factor	for RGB	channels between 0 and
	      100. The default is 75.
	      In case of lossless compression (default), a  small  factor  en-
	      ables faster compression speed, but produces a larger file. Max-
	      imum compression is achieved by using a value of 100.
	      In case of lossy compression (specified by the -lossy option), a
	      small  factor  produces  a smaller file with lower quality. Best
	      quality is achieved by using a value of 100.

       -m int Specify the compression method to	use. This  parameter  controls
	      the  trade  off  between	encoding speed and the compressed file
	      size and quality.	 Possible values range from 0  to  6.  Default
	      value is 4.  When	higher values are used,	the encoder will spend
	      more time	inspecting additional encoding possibilities  and  de-
	      cide on the quality gain.	 Lower value can result	is faster pro-
	      cessing time at the expense of larger file size and  lower  com-
	      pression quality.

       -min_size
	      Encode  image  to	achieve	smallest size. This disables key frame
	      insertion	and picks the dispose  method  resulting  in  smallest
	      output  for each frame. It uses lossless compression by default,
	      but can be combined with -q, -m, -lossy or -mixed	options.

       -kmin int

       -kmax int
	      Specify the minimum and maximum distance between consecutive key
	      frames (independently decodable frames) in the output animation.
	      The tool will insert some	key frames into	the  output  animation
	      as needed	so that	this criteria is satisfied.
	      A	 'kmax'	 value	of  0 will turn	off insertion of key frames. A
	      'kmax' value of 1	will result in all frames  being  key  frames.
	      'kmin'  value  is	 not  taken into account in both these special
	      cases.  Typical values are in the	range 3	to 30. Default	values
	      are  kmin	 = 9, kmax = 17	for lossless compression and kmin = 3,
	      kmax = 5 for lossy compression.
	      These two	options	are relevant only  for	animated  images  with
	      large number of frames (>50).
	      When lower values	are used, more frames will be converted	to key
	      frames. This may lead to smaller number of  frames  required  to
	      decode  a	 frame on average, thereby improving the decoding per-
	      formance.	But this may  lead  to	slightly  bigger  file	sizes.
	      Higher  values  may  lead	 to  worse  decoding  performance, but
	      smaller file sizes.
	      Some restrictions:
	      (i) kmin < kmax,
	      (ii) kmin	>= kmax	/ 2 + 1	and
	      (iii) kmax - kmin	<= 30.
	      If any of	these restrictions are not met,	they will be  enforced
	      automatically.

       -metadata string
	      A	comma separated	list of	metadata to copy from the input	to the
	      output if	present.  Valid	values:	all, none, icc,	xmp.  The  de-
	      fault is xmp.

       -f int For  lossy encoding only (specified by the -lossy	option). Spec-
	      ify the strength of the deblocking filter, between 0 (no filter-
	      ing)  and	 100  (maximum filtering).  A value of 0 will turn off
	      any filtering. Higher value will increase	the  strength  of  the
	      filtering	process	applied	after decoding the picture. The	higher
	      the value	the smoother the picture will appear.  Typical	values
	      are usually in the range of 20 to	50.

       -mt    Use  multi-threading  for	 encoding, if possible.	This option is
	      only effective when using	lossy compression.

       -v     Print extra information.

       -quiet Do not print anything.

BUGS
       Please	 report	    all	    bugs     to	    the	    issue     tracker:
       https://bugs.chromium.org/p/webp
       Patches	welcome!  See  this  page  to get started: http://www.webmpro-
       ject.org/code/contribute/submitting-patches/

EXAMPLES
       gif2webp	picture.gif -o picture.webp
       gif2webp	-q 70 picture.gif -o picture.webp
       gif2webp	-lossy -m 3 picture.gif	-o picture_lossy.webp
       gif2webp	-lossy -f 50 picture.gif -o picture.webp
       gif2webp	-q 70 -o picture.webp -- ---picture.gif

AUTHORS
       gif2webp	is a part of libwebp and was written by	the WebP team.
       The  latest  source  tree  is  available	 at   https://chromium.google-
       source.com/webm/libwebp

       This  manual  page was written by Urvang	Joshi <urvang@google.com>, for
       the Debian project (and may be used by others).

SEE ALSO
       cwebp(1), dwebp(1), webpmux(1)
       Please refer to http://developers.google.com/speed/webp/	for additional
       information.

			       January 25, 2017			   GIF2WEBP(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | BUGS | EXAMPLES | AUTHORS | SEE ALSO

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