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.

       -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.  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. 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.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 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.

                                        December 17, 2013                             GIF2WEBP(1)