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.\"                                      Hey, EMACS: -*- nroff -*-
.TH VWEBP 1 "July 18, 2024"
.SH NAME
vwebp \- decompress a WebP file and display it in a window
.SH SYNOPSIS
.B vwebp
.RI [ options ] " input_file.webp
.br
.SH DESCRIPTION
This manual page documents the
.B vwebp
command.
.PP
\fBvwebp\fP decompresses a WebP file and displays it in a window using OpenGL.
.SH OPTIONS
.TP
.B \-h
Print usage summary.
.TP
.B \-version
Print version number and exit.
.TP
.B \-noicc
Don't use the ICC profile if present.
.TP
.B \-nofancy
Don't use the fancy YUV420 upscaler.
.TP
.B \-nofilter
Disable in-loop filtering.
.TP
.BI \-dither " strength
Specify a dithering \fBstrength\fP between 0 and 100. Dithering is a
post-processing effect applied to chroma components in lossy compression.
It helps by smoothing gradients and avoiding banding artifacts. Default: 50.
.TP
.BI \-noalphadither
By default, quantized transparency planes are dithered during decompression,
to smooth the gradients. This flag will prevent this dithering.
.TP
.B \-usebgcolor
Fill transparent areas with the bitstream's own background color instead of
checkerboard only. Default is white for non-animated images.
.TP
.B \-mt
Use multi-threading for decoding, if possible.
.TP
.B \-info
Display image information on top of the decoded image.
.TP
.BI \-\- " string
Explicitly specify the input file. This option is useful if the input
file starts with an '\-' for instance. This option must appear \fBlast\fP.
Any other options afterward will be ignored. If the input file is "\-",
the data will be read from \fIstdin\fP instead of a file.
.TP

.SH KEYBOARD SHORTCUTS
.TP
.B 'c'
Toggle use of color profile.
.TP
.B 'b'
Toggle display of background color.
.TP
.B 'i'
Overlay file information.
.TP
.B 'd'
Disable blending and disposal process, for debugging purposes.
.TP
.B 'q' / 'Q' / ESC
Quit.

.SH EXIT STATUS
If there were no problems during execution, \fBvwebp\fP exits with the value of
the C constant \fBEXIT_SUCCESS\fP. This is usually zero.
.PP
If an error occurs, \fBvwebp\fP exits with the value of the C constant
\fBEXIT_FAILURE\fP. This is usually one.

.SH EXAMPLES
vwebp picture.webp
.br
vwebp picture.webp -mt -dither 0
.br
vwebp \-\- \-\-\-picture.webp

.SH AUTHORS
\fBvwebp\fP is a part of libwebp and was written by the WebP team.
.br
The latest source tree is available at
https://chromium.googlesource.com/webm/libwebp
.PP
This manual page was written for the Debian project (and may be used by others).

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

.SH SEE ALSO
.BR dwebp (1)
.br
Please refer to https://developers.google.com/speed/webp/ for additional
information.

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