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Usage:
img2webp [file-level options] [image files...] [per-frame options...]
File-level options (only used at the start of compression):
-min_size ............ minimize size
-loop <int> .......... loop count (default: 0, = infinite loop)
-kmax <int> .......... maximum number of frame between key-frames
(0=only keyframes)
-kmin <int> .......... minimum number of frame between key-frames
(0=disable key-frames altogether)
-mixed ............... use mixed lossy/lossless automatic mode
-v ................... verbose mode
-h ................... this help
Per-frame options (only used for subsequent images input):
-d <int> ............. frame duration in ms (default: 100)
-lossless ........... use lossless mode (default)
-lossy ... ........... use lossy mode
-q <float> ........... quality
-m <int> ............. method to use
example: img2webp -loop 2 in0.png -lossy in1.jpg
-d 80 in2.tiff -o out.webp
Change-Id: I23771b90eaf0660f420d7ffd304e704155386286
98 lines
3.0 KiB
Groff
98 lines
3.0 KiB
Groff
.\" Hey, EMACS: -*- nroff -*-
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.TH IMG2WEBP 1 "December 1, 2016"
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.SH NAME
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img2webp \- create animated WebP file from a sequence of input images.
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.SH SYNOPSIS
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.B img2webp
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.R [file_level_options] [files] [per_frame_options...]
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.br
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.SH DESCRIPTION
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This manual page documents the
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.B img2webp
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command.
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.PP
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\fBimg2webp\fP compresses a sequence of images using the animated WebP format.
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Input images can either be PNG, JPEG, TIFF or WebP.
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.SH FILE-LEVEL OPTIONS
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The file-level options are applied at the beginning of the compression process,
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before the input frames are read.
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.TP
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.BI \-o " string
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Specify the name of the output WebP file.
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.TP
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.BI \-min_size
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Encode images to achieve smallest size. This disables key frame insertion and
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picks the parameters resulting in smallest output for each frame. It uses
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lossless compression by default, but can be combined with \-q, \-m, \-lossy or
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\-mixed options.
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.TP
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.BI \-kmin " int
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.TP
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.BI \-kmax " int
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Specify the minimum and maximum distance between consecutive key frames
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(independently decodable frames) in the output animation. The tool will insert
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some key frames into the output animation as needed so that this criteria is
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satisfied.
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.br
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.B \-mixed
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Mixed compression mode: optimize compression of the image by picking either
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lossy or lossless compression for each frame heuristically. This global
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option disables the local option \fB-lossy\fP and \fB-lossless\fP .
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.TP
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.BI \-loop " int
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Specifies the number of times the animation should loop. Using '0' means
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'loop indefinitely'.
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.TP
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.BI \-v
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Be more verbose.
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.TP
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.B \-h, \-help
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A short usage summary.
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.SH PER-FRAME OPTIONS
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The per-frame options are applied for the images following as arguments in the
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command line. They can be modified any number of times preceding each particular
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input image.
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.TP
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.BI \-d " int
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Specify the image duration in milliseconds.
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.TP
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.B \-lossless, \-lossy
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Compress the next image(s) using lossless or lossy compression mode. The
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default mode is lossless.
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.TP
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.BI \-q " float
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Specify the compression factor between 0 and 100. The default is 75.
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.TP
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.BI \-m " int
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Specify the compression method to use. This parameter controls the
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trade off between encoding speed and the compressed file size and quality.
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Possible values range from 0 to 6. Default value is 4.
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.SH EXAMPLE
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img2webp -loop 2 in0.png -lossy in1.jpg -d 80 in2.tiff -o out.webp
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.br
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.SH BUGS
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Please report all bugs to the issue tracker:
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https://bugs.chromium.org/p/webp
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.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/
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.SH AUTHORS
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\fBimg2webp\fP is a part of libwebp and was written by the WebP team.
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.br
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The latest source tree is available at
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https://chromium.googlesource.com/webm/libwebp
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.PP
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This manual page was written by Pascal Massimino <pascal.massimino@gmail.com>,
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for the Debian project (and may be used by others).
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.SH SEE ALSO
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.BR webpmux (1),
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.BR gif2webp (1)
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.br
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Please refer to http://developers.google.com/speed/webp/ for additional
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information.
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