img2webp(1) General Commands Manual img2webp(1)
NAME
img2webp - create animated WebP file from a sequence of input images.
SYNOPSIS
img2webp [file_options] [[frame_options] frame_file]... [-o webp_file]
img2webp argument_file_name
DESCRIPTION
This manual page documents the img2webp command.
img2webp compresses a sequence of images using the animated WebP
format. Input images can either be PNG, JPEG, TIFF or WebP. If a
single file name (not starting with the character '-') is supplied as
the argument, the command line arguments are actually tokenized from
this file. This allows for easy scripting or using a large number of
arguments.
FILE-LEVEL OPTIONS
The file-level options are applied at the beginning of the compression
process, before the input frames are read.
-o string
Specify the name of the output WebP file.
-min_size
Encode images to achieve smallest size. This disables key frame
insertion and picks the parameters 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.
-mixed Mixed compression mode: optimize compression of the image
by picking either lossy or lossless compression for each frame
heuristically. This global option disables the local option
-lossy and -lossless .
-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.
-loop int
Specifies the number of times the animation should loop. Using
'0' means 'loop indefinitely'.
-v Be more verbose.
-h, -help
A short usage summary.
-version
Print the version numbers of the relevant libraries used.
PER-FRAME OPTIONS
The per-frame options are applied for the images following as arguments
in the command line. They can be modified any number of times preceding
each particular input image.
-d int Specify the image duration in milliseconds.
-lossless, -lossy
Compress the next image(s) using lossless or lossy compression
mode. The default mode is lossless.
-q float
Specify the compression factor between 0 and 100. The default is
75.
-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 in faster
processing time at the expense of larger file size and lower
compression quality.
-exact, -noexact
Preserve or alter RGB values in transparent area. The default is
-noexact, to help compressibility. Note -noexact may cause
artifacts in frames compressed with -lossy.
EXIT STATUS
If there were no problems during execution, img2webp exits with the
value of the C constant EXIT_SUCCESS. This is usually zero.
If an error occurs, img2webp exits with the value of the C constant
EXIT_FAILURE. This is usually one.
EXAMPLE
img2webp -loop 2 in0.png -lossy in1.jpg -d 80 in2.tiff -o out.webp
AUTHORS
img2webp 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 Pascal Massimino
<pascal.massimino@gmail.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
webpmux(1), gif2webp(1)
Please refer to https://developers.google.com/speed/webp/ for
additional information.
November 26, 2024 img2webp(1)
webp 1.5.0 - Generated Sun Dec 29 19:09:39 CST 2024