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'.

       -- string
	      Explicitly specify the input file. This option is useful if the
	      input file starts with an '-' for instance. This option must
	      appear last.  Any other options afterward will be ignored. If
	      the input file is "-", the data will be read from stdin instead
	      of a file.

       -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.

       -near_lossless int
	      Specify the level of near-lossless image preprocessing. This
	      option adjusts pixel values to help compressibility, but has
	      minimal impact on the visual quality. It triggers lossless
	      compression mode automatically. The range is 0 (maximum
	      preprocessing) to 100 (no preprocessing, the default). The
	      typical value is around 60. Note that lossy with -q 100 can at
	      times yield better results.

       -sharp_yuv
	      Use more accurate and sharper RGB->YUV conversion. Note that
	      this process is slower than the default 'fast' RGB->YUV
	      conversion.

       -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 the 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.


EXIT STATUS
       If there were no problems during execution, gif2webp exits with the
       value of the C constant EXIT_SUCCESS. This is usually zero.

       If an error occurs, gif2webp exits with the value of the C constant
       EXIT_FAILURE. This is usually one.


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
       cat picture.gif | gif2webp -o - -- - > output.webp


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).


REPORTING BUGS
       Please report all bugs to the issue tracker:
       https://issues.webmproject.org
       Patches welcome! See this page to get started:
       https://www.webmproject.org/code/contribute/submitting-patches/


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

			       November 4, 2024			   GIF2WEBP(1)