GIF2WEBP(1)                                                        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
              enables  faster  compression  speed, but produces a larger file.
              Maximum 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
              decide  on  the  quality gain.  Lower value can result is faster
              processing time at the expense of larger  file  size  and  lower
              compression quality.

       -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 'kmin' value of 0 will turn off insertion of key frames.  Typ‐
              ical  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
              default 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     our     issue    tracker:
       http://code.google.com/p/webp/issues
       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 was written by the WebP team.
       The latest source tree is available at http://www.webmproject.org/code

       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.



                                 March 7, 2014                     GIF2WEBP(1)
