webp-simple-converter/bin/libwebp_linux/doc/vwebp.txt

A small node.js library for converting any image to webp file format or converting webp image to any image file format.

VWEBP(1)                    General Commands Manual                   VWEBP(1)



NAME
       vwebp - decompress a WebP file and display it in a window

SYNOPSIS
       vwebp [options] input_file.webp

DESCRIPTION
       This manual page documents the vwebp command.

       vwebp  decompresses  a  WebP  file  and  displays  it in a window using
       OpenGL.

OPTIONS
       -h     Print usage summary.

       -version
              Print version number and exit.

       -noicc Don't use the ICC profile if present.

       -nofancy
              Don't use the fancy YUV420 upscaler.

       -nofilter
              Disable in-loop filtering.

       -dither strength
              Specify a dithering strength between 0 and 100. Dithering  is  a
              post-processing  effect  applied  to  chroma components in lossy
              compression.  It helps by smoothing gradients and avoiding band-
              ing artifacts. Default: 50.

       -noalphadither
              By  default,  quantized  transparency planes are dithered during
              decompression, to smooth the gradients. This flag  will  prevent
              this dithering.

       -usebgcolor
              Fill transparent areas with the bitstream's own background color
              instead of checkerboard only. Default is white for  non-animated
              images.

       -mt    Use multi-threading for decoding, if possible.

       -info  Display image information on top of the decoded image.

       -- string
              Explicitly  specify the input file. This option is useful if the
              input file starts with an '-' for instance. This option must ap-
              pear  last.  Any other options afterward will be ignored. If the
              input file is "-", the data will be read from stdin instead of a
              file.



       KEYBOARD SHORTCUTS

       'c'    Toggle use of color profile.

       'b'    Toggle display of background color.

       'i'    Overlay file information.

       'd'    Disable blending and disposal process, for debugging purposes.

       'q' / 'Q' / ESC
              Quit.


BUGS
       Please     report     all     bugs     to     the     issue    tracker:
       https://bugs.chromium.org/p/webp
       Patches welcome! See this  page  to  get  started:  http://www.webmpro-
       ject.org/code/contribute/submitting-patches/


EXAMPLES
       vwebp picture.webp
       vwebp picture.webp -mt -dither 0
       vwebp -- ---picture.webp


AUTHORS
       vwebp is a part of libwebp and was written by the WebP team.
       The   latest  source  tree  is  available  at  https://chromium.google-
       source.com/webm/libwebp

       This manual page was written for the Debian project (and may be used by
       others).


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



                                 June 5, 2019                         VWEBP(1)