mirror of
https://github.com/ahabhyde/miguelbridge
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304 lines
8.5 KiB
HTML
304 lines
8.5 KiB
HTML
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<!-- Creator : groff version 1.19.2 -->
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<!-- CreationDate: Fri Sep 19 17:51:07 2014 -->
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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"http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta name="generator" content="groff -Thtml, see www.gnu.org">
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<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
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<meta name="Content-Style" content="text/css">
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<style type="text/css">
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p { margin-top: 0; margin-bottom: 0; }
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pre { margin-top: 0; margin-bottom: 0; }
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table { margin-top: 0; margin-bottom: 0; }
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</style>
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<title>GIF2WEBP</title>
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</head>
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<body>
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<h1 align=center>GIF2WEBP</h1>
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<a href="#NAME">NAME</a><br>
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<a href="#SYNOPSIS">SYNOPSIS</a><br>
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<a href="#DESCRIPTION">DESCRIPTION</a><br>
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<a href="#OPTIONS">OPTIONS</a><br>
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<a href="#BUGS">BUGS</a><br>
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<a href="#EXAMPLES">EXAMPLES</a><br>
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<a href="#AUTHORS">AUTHORS</a><br>
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<a href="#SEE ALSO">SEE ALSO</a><br>
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<hr>
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<a name="NAME"></a>
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<h2>NAME</h2>
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<p style="margin-left:11%; margin-top: 1em">gif2webp
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− Convert a GIF image to WebP</p>
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<a name="SYNOPSIS"></a>
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<h2>SYNOPSIS</h2>
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<p style="margin-left:11%; margin-top: 1em"><b>gif2webp</b>
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[<i>options</i>] <i>input_file.gif −o
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output_file.webp</i></p>
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<a name="DESCRIPTION"></a>
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<h2>DESCRIPTION</h2>
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<p style="margin-left:11%; margin-top: 1em">This manual
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page documents the <b>gif2webp</b> command.</p>
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<p style="margin-left:11%; margin-top: 1em"><b>gif2webp</b>
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converts a GIF image to a WebP image.</p>
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<a name="OPTIONS"></a>
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<h2>OPTIONS</h2>
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<p style="margin-left:11%; margin-top: 1em">The basic
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options are: <b><br>
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−o</b> <i>string</i></p>
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<p style="margin-left:22%;">Specify the name of the output
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WebP file. If omitted, <b>gif2webp</b> will perform
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conversion but only report statistics. Using
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"−" as output name will direct output to
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’stdout’.</p>
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<p style="margin-left:11%;"><b>−h,
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−help</b></p>
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<p style="margin-left:22%;">Usage information.</p>
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<p style="margin-left:11%;"><b>−version</b></p>
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<p style="margin-left:22%;">Print the version number (as
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major.minor.revision) and exit.</p>
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<table width="100%" border=0 rules="none" frame="void"
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cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="9%">
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<p style="margin-top: 1em" valign="top"><b>−lossy</b></p> </td>
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<td width="2%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Encode the image
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using lossy compression.</p></td>
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="9%">
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<p style="margin-top: 1em" valign="top"><b>−mixed</b></p> </td>
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<td width="2%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Mixed compression
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mode: optimize compression of the image by picking either
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lossy or lossless compression for each frame
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heuristically.</p> </td>
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</table>
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<p style="margin-left:11%;"><b>−q</b>
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<i>float</i></p>
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<p style="margin-left:22%;">Specify the compression factor
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for RGB channels between 0 and 100. The default is 75. <br>
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In case of lossless compression (default), a small factor
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enables faster compression speed, but produces a larger
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file. Maximum compression is achieved by using a value of
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100. <br>
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In case of lossy compression (specified by the −lossy
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option), a small factor produces a smaller file with lower
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quality. Best quality is achieved by using a value of
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100.</p>
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<table width="100%" border=0 rules="none" frame="void"
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cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="9%">
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<p style="margin-top: 1em" valign="top"><b>−m</b>
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<i>int</i></p> </td>
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<td width="2%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Specify the
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compression method to use. This parameter controls the trade
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off between encoding speed and the compressed file size and
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quality. Possible values range from 0 to 6. Default value is
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4. When higher values are used, the encoder will spend more
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time inspecting additional encoding possibilities and decide
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on the quality gain. Lower value can result is faster
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processing time at the expense of larger file size and lower
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compression quality.</p></td>
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</table>
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<p style="margin-left:11%;"><b>−kmin</b> <i>int</i>
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<b><br>
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−kmax</b> <i>int</i></p>
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<p style="margin-left:22%;">Specify the minimum and maximum
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distance between consecutive key frames (independently
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decodable frames) in the output animation. The tool will
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insert some key frames into the output animation as needed
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so that this criteria is satisfied. <br>
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A ’kmin’ value of 0 will turn off insertion of
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key frames. Typical values are in the range 3 to 30. Default
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values are kmin = 9, kmax = 17 for lossless compression and
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kmin = 3, kmax = 5 for lossy compression. <br>
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These two options are relevant only for animated images with
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large number of frames (>50). <br>
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When lower values are used, more frames will be converted to
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key frames. This may lead to smaller number of frames
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required to decode a frame on average, thereby improving the
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decoding performance. But this may lead to slightly bigger
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file sizes. Higher values may lead to worse decoding
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performance, but smaller file sizes. <br>
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Some restrictions: <br>
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(i) kmin < kmax, <br>
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(ii) kmin >= kmax / 2 + 1 and <br>
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(iii) kmax - kmin <= 30. <br>
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If any of these restrictions are not met, they will be
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enforced automatically.</p>
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<p style="margin-left:11%;"><b>−metadata</b>
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<i>string</i></p>
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<p style="margin-left:22%;">A comma separated list of
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metadata to copy from the input to the output if present.
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Valid values: <b>all</b>, <b>none</b>, <b>icc</b>,
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<b>xmp</b>. The default is <b>xmp</b>.</p>
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<table width="100%" border=0 rules="none" frame="void"
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cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="9%">
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<p style="margin-top: 1em" valign="top"><b>−f</b>
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<i>int</i></p> </td>
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<td width="2%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">For lossy encoding
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only (specified by the −lossy option). Specify the
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strength of the deblocking filter, between 0 (no filtering)
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and 100 (maximum filtering). A value of 0 will turn off any
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filtering. Higher value will increase the strength of the
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filtering process applied after decoding the picture. The
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higher the value the smoother the picture will appear.
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Typical values are usually in the range of 20 to 50.</p></td>
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="9%">
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<p style="margin-top: 1em" valign="top"><b>−mt</b></p> </td>
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<td width="2%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Use multi-threading
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for encoding, if possible. This option is only effective
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when using lossy compression.</p></td>
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="9%">
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<p style="margin-top: 1em" valign="top"><b>−v</b></p> </td>
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<td width="2%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Print extra
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information.</p> </td>
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<tr valign="top" align="left">
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<td width="11%"></td>
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<td width="9%">
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<p style="margin-top: 1em" valign="top"><b>−quiet</b></p> </td>
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<td width="2%"></td>
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<td width="78%">
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<p style="margin-top: 1em" valign="top">Do not print
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anything.</p> </td>
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</table>
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<a name="BUGS"></a>
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<h2>BUGS</h2>
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<p style="margin-left:11%; margin-top: 1em">Please report
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all bugs to our issue tracker:
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http://code.google.com/p/webp/issues <br>
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Patches welcome! See this page to get started:
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http://www.webmproject.org/code/contribute/submitting-patches/</p>
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<a name="EXAMPLES"></a>
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<h2>EXAMPLES</h2>
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<p style="margin-left:11%; margin-top: 1em">gif2webp
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picture.gif −o picture.webp <br>
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gif2webp −q 70 picture.gif −o picture.webp <br>
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gif2webp −lossy −m 3 picture.gif −o
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picture_lossy.webp <br>
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gif2webp −lossy −f 50 picture.gif −o
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picture.webp <br>
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gif2webp −q 70 −o picture.webp −−
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−−−picture.gif</p>
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<a name="AUTHORS"></a>
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<h2>AUTHORS</h2>
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<p style="margin-left:11%; margin-top: 1em"><b>gif2webp</b>
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was written by the WebP team. <br>
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The latest source tree is available at
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http://www.webmproject.org/code</p>
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<p style="margin-left:11%; margin-top: 1em">This manual
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page was written by Urvang Joshi <urvang@google.com>,
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for the Debian project (and may be used by others).</p>
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<a name="SEE ALSO"></a>
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<h2>SEE ALSO</h2>
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<p style="margin-left:11%; margin-top: 1em"><b>cwebp</b>(1),
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<b>dwebp</b>(1), <b>webpmux</b>(1) <br>
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Please refer to http://developers.google.com/speed/webp/ for
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additional information.</p>
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<hr>
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</body>
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</html>
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