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.

       -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  performance.  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). Specify the  strength  of
              the  deblocking  filter,  between  0 (no filtering) 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.  -loop_compatibility If enabled,
              handle the loop information in a compatible fashion for Chrome version prior to M62
              (inclusive) and Firefox.

       -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.webmproject.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.googlesource.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.

                                        September 20, 2017                            GIF2WEBP(1)