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)