2018-05-24 12:41:45 +02:00
|
|
|
<!-- Creator : groff version 1.21 -->
|
2018-07-16 17:12:25 +02:00
|
|
|
<!-- CreationDate: Mon Jul 28 19:47:27 2014 -->
|
2018-05-24 12:41:45 +02:00
|
|
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
|
|
|
|
|
"http://www.w3.org/TR/html4/loose.dtd">
|
|
|
|
|
<html>
|
|
|
|
|
<head>
|
|
|
|
|
<meta name="generator" content="groff -Thtml, see www.gnu.org">
|
|
|
|
|
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
|
|
|
|
|
<meta name="Content-Style" content="text/css">
|
|
|
|
|
<style type="text/css">
|
|
|
|
|
p { margin-top: 0; margin-bottom: 0; vertical-align: top }
|
|
|
|
|
pre { margin-top: 0; margin-bottom: 0; vertical-align: top }
|
|
|
|
|
table { margin-top: 0; margin-bottom: 0; vertical-align: top }
|
|
|
|
|
h1 { text-align: center }
|
|
|
|
|
</style>
|
|
|
|
|
<title>GIF2WEBP</title>
|
|
|
|
|
|
|
|
|
|
</head>
|
|
|
|
|
<body>
|
|
|
|
|
|
|
|
|
|
<h1 align="center">GIF2WEBP</h1>
|
|
|
|
|
|
|
|
|
|
<a href="#NAME">NAME</a><br>
|
|
|
|
|
<a href="#SYNOPSIS">SYNOPSIS</a><br>
|
|
|
|
|
<a href="#DESCRIPTION">DESCRIPTION</a><br>
|
|
|
|
|
<a href="#OPTIONS">OPTIONS</a><br>
|
|
|
|
|
<a href="#BUGS">BUGS</a><br>
|
|
|
|
|
<a href="#EXAMPLES">EXAMPLES</a><br>
|
|
|
|
|
<a href="#AUTHORS">AUTHORS</a><br>
|
|
|
|
|
<a href="#SEE ALSO">SEE ALSO</a><br>
|
|
|
|
|
|
|
|
|
|
<hr>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<h2>NAME
|
|
|
|
|
<a name="NAME"></a>
|
|
|
|
|
</h2>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em">gif2webp
|
|
|
|
|
− Convert a GIF image to WebP</p>
|
|
|
|
|
|
|
|
|
|
<h2>SYNOPSIS
|
|
|
|
|
<a name="SYNOPSIS"></a>
|
|
|
|
|
</h2>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em"><b>gif2webp</b>
|
|
|
|
|
[<i>options</i>] <i>input_file.gif −o
|
|
|
|
|
output_file.webp</i></p>
|
|
|
|
|
|
|
|
|
|
<h2>DESCRIPTION
|
|
|
|
|
<a name="DESCRIPTION"></a>
|
|
|
|
|
</h2>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em">This manual
|
|
|
|
|
page documents the <b>gif2webp</b> command.</p>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em"><b>gif2webp</b>
|
|
|
|
|
converts a GIF image to a WebP image.</p>
|
|
|
|
|
|
|
|
|
|
<h2>OPTIONS
|
|
|
|
|
<a name="OPTIONS"></a>
|
|
|
|
|
</h2>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em">The basic
|
|
|
|
|
options are: <b><br>
|
|
|
|
|
−o</b> <i>string</i></p>
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:22%;">Specify the name of the output
|
|
|
|
|
WebP file. If omitted, <b>gif2webp</b> will perform
|
|
|
|
|
conversion but only report statistics. Using
|
|
|
|
|
"−" as output name will direct output to
|
|
|
|
|
’stdout’.</p>
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%;"><b>−h,
|
|
|
|
|
−help</b></p>
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:22%;">Usage information.</p>
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%;"><b>−version</b></p>
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:22%;">Print the version number (as
|
|
|
|
|
major.minor.revision) and exit.</p>
|
|
|
|
|
|
|
|
|
|
<table width="100%" border="0" rules="none" frame="void"
|
|
|
|
|
cellspacing="0" cellpadding="0">
|
|
|
|
|
<tr valign="top" align="left">
|
|
|
|
|
<td width="11%"></td>
|
|
|
|
|
<td width="9%">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p><b>−lossy</b></p></td>
|
|
|
|
|
<td width="2%"></td>
|
|
|
|
|
<td width="78%">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p>Encode the image using lossy compression.</p></td></tr>
|
|
|
|
|
<tr valign="top" align="left">
|
|
|
|
|
<td width="11%"></td>
|
|
|
|
|
<td width="9%">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p><b>−mixed</b></p></td>
|
|
|
|
|
<td width="2%"></td>
|
|
|
|
|
<td width="78%">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p>Mixed compression mode: optimize compression of the
|
|
|
|
|
image by picking either lossy or lossless compression for
|
|
|
|
|
each frame heuristically.</p></td></tr>
|
|
|
|
|
</table>
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%;"><b>−q</b>
|
|
|
|
|
<i>float</i></p>
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:22%;">Specify the compression factor
|
|
|
|
|
for RGB channels between 0 and 100. The default is 75. <br>
|
|
|
|
|
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. <br>
|
|
|
|
|
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.</p>
|
|
|
|
|
|
|
|
|
|
<table width="100%" border="0" rules="none" frame="void"
|
|
|
|
|
cellspacing="0" cellpadding="0">
|
|
|
|
|
<tr valign="top" align="left">
|
|
|
|
|
<td width="11%"></td>
|
|
|
|
|
<td width="9%">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p><b>−m</b> <i>int</i></p></td>
|
|
|
|
|
<td width="2%"></td>
|
|
|
|
|
<td width="78%">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p>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.</p></td></tr>
|
|
|
|
|
</table>
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%;"><b>−kmin</b> <i>int</i>
|
|
|
|
|
<b><br>
|
|
|
|
|
−kmax</b> <i>int</i></p>
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:22%;">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. <br>
|
|
|
|
|
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. <br>
|
|
|
|
|
These two options are relevant only for animated images with
|
|
|
|
|
large number of frames (>50). <br>
|
|
|
|
|
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. <br>
|
|
|
|
|
Some restrictions: <br>
|
|
|
|
|
(i) kmin < kmax, <br>
|
|
|
|
|
(ii) kmin >= kmax / 2 + 1 and <br>
|
|
|
|
|
(iii) kmax - kmin <= 30. <br>
|
|
|
|
|
If any of these restrictions are not met, they will be
|
|
|
|
|
enforced automatically.</p>
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%;"><b>−metadata</b>
|
|
|
|
|
<i>string</i></p>
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:22%;">A comma separated list of
|
|
|
|
|
metadata to copy from the input to the output if present.
|
|
|
|
|
Valid values: <b>all</b>, <b>none</b>, <b>icc</b>,
|
|
|
|
|
<b>xmp</b>. The default is <b>xmp</b>.</p>
|
|
|
|
|
|
|
|
|
|
<table width="100%" border="0" rules="none" frame="void"
|
|
|
|
|
cellspacing="0" cellpadding="0">
|
|
|
|
|
<tr valign="top" align="left">
|
|
|
|
|
<td width="11%"></td>
|
|
|
|
|
<td width="9%">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p><b>−f</b> <i>int</i></p></td>
|
|
|
|
|
<td width="2%"></td>
|
|
|
|
|
<td width="78%">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p>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.</p></td></tr>
|
|
|
|
|
<tr valign="top" align="left">
|
|
|
|
|
<td width="11%"></td>
|
|
|
|
|
<td width="9%">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p><b>−mt</b></p></td>
|
|
|
|
|
<td width="2%"></td>
|
|
|
|
|
<td width="78%">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p>Use multi-threading for encoding, if possible. This
|
|
|
|
|
option is only effective when using lossy compression.</p></td></tr>
|
|
|
|
|
<tr valign="top" align="left">
|
|
|
|
|
<td width="11%"></td>
|
|
|
|
|
<td width="9%">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p><b>−v</b></p></td>
|
|
|
|
|
<td width="2%"></td>
|
|
|
|
|
<td width="78%">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p>Print extra information.</p></td></tr>
|
|
|
|
|
<tr valign="top" align="left">
|
|
|
|
|
<td width="11%"></td>
|
|
|
|
|
<td width="9%">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p><b>−quiet</b></p></td>
|
|
|
|
|
<td width="2%"></td>
|
|
|
|
|
<td width="78%">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p>Do not print anything.</p></td></tr>
|
|
|
|
|
</table>
|
|
|
|
|
|
|
|
|
|
<h2>BUGS
|
|
|
|
|
<a name="BUGS"></a>
|
|
|
|
|
</h2>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em">Please report
|
|
|
|
|
all bugs to our issue tracker:
|
|
|
|
|
http://code.google.com/p/webp/issues <br>
|
|
|
|
|
Patches welcome! See this page to get started:
|
|
|
|
|
http://www.webmproject.org/code/contribute/submitting-patches/</p>
|
|
|
|
|
|
|
|
|
|
<h2>EXAMPLES
|
|
|
|
|
<a name="EXAMPLES"></a>
|
|
|
|
|
</h2>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em">gif2webp
|
|
|
|
|
picture.gif −o picture.webp <br>
|
|
|
|
|
gif2webp −q 70 picture.gif −o picture.webp <br>
|
|
|
|
|
gif2webp −lossy −m 3 picture.gif −o
|
|
|
|
|
picture_lossy.webp <br>
|
|
|
|
|
gif2webp −lossy −f 50 picture.gif −o
|
|
|
|
|
picture.webp <br>
|
|
|
|
|
gif2webp −q 70 −o picture.webp −−
|
|
|
|
|
−−−picture.gif</p>
|
|
|
|
|
|
|
|
|
|
<h2>AUTHORS
|
|
|
|
|
<a name="AUTHORS"></a>
|
|
|
|
|
</h2>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em"><b>gif2webp</b>
|
|
|
|
|
was written by the WebP team. <br>
|
|
|
|
|
The latest source tree is available at
|
|
|
|
|
http://www.webmproject.org/code</p>
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em">This manual
|
|
|
|
|
page was written by Urvang Joshi <urvang@google.com>,
|
|
|
|
|
for the Debian project (and may be used by others).</p>
|
|
|
|
|
|
|
|
|
|
<h2>SEE ALSO
|
|
|
|
|
<a name="SEE ALSO"></a>
|
|
|
|
|
</h2>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<p style="margin-left:11%; margin-top: 1em"><b>cwebp</b>(1),
|
|
|
|
|
<b>dwebp</b>(1), <b>webpmux</b>(1) <br>
|
|
|
|
|
Please refer to http://developers.google.com/speed/webp/ for
|
|
|
|
|
additional information.</p>
|
|
|
|
|
<hr>
|
|
|
|
|
</body>
|
|
|
|
|
</html>
|
