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DWEBP(1)										 DWEBP(1)

NAME
       dwebp - decompress a WebP file to an image file

SYNOPSIS
       dwebp [options] input_file.webp

DESCRIPTION
       This manual page documents the dwebp command.

       dwebp decompresses WebP files into PNG, PAM, PPM or PGM images.

OPTIONS
       The basic options are:

       -h     Print usage summary.

       -version
	      Print the version number (as major.minor.revision) and exit.

       -o string
	      Specify the name of the output file (as PNG format by default).

       -pam   Change the output format to PAM (retains alpha).

       -ppm   Change the output format to PPM (discards alpha).

       -pgm   Change the output format to PGM. The output consists of luma/chroma samples instead
	      of RGB, using the ICM4 layout. This option is mainly for verification and debugging
	      purposes.

       -yuv   Change  the output format to raw YUV. The output consists of luma/chroma-U/chroma-V
	      samples instead of RGB, saved sequentially as individual	planes.  This  option  is
	      mainly for verification and debugging purposes.

       -nofancy
	      Don't  use  the fancy upscaler for YUV420. This may lead to jaggy edges (especially
	      the red ones), but should be faster.

       -nofilter
	      Don't use the in-loop filtering process even if it is required  by  the  bitstream.
	      This  may  produce  visible  blocks  on the non-compliant output, but will make the
	      decoding faster.

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

       -crop x_position y_position width height
	      Crop the decoded picture	to  a  rectangle  with	top-left  corner  at  coordinates
	      (x_position, y_position) and size width x height.  This cropping area must be fully
	      contained within the source rectangle.  The top-left corner will be snapped to even
	      coordinates  if needed.  This option is meant to reduce the memory needed for crop-
	      ping large images.  Note: the cropping is applied before any scaling.

       -scale width height
	      Rescale the decoded picture to dimension width x	height.  This  option  is  mostly
	      intended	to  reducing  the memory needed to decode large images, when only a small
	      version is needed (thumbnail, preview, etc.).  Note: scaling is applied after crop-
	      ping.

       -v     Print extra information (decoding time in particular).

       -noasm Disable all assembly optimizations.

BUGS
       Please report all bugs to our issue tracker: http://code.google.com/p/webp/issues
       Patches	welcome!  See  this page to get started: http://www.webmproject.org/code/contrib-
       ute/submitting-patches/

EXAMPLES
       dwebp picture.webp -o output.png
       dwebp picture.webp -ppm -o output.ppm

AUTHORS
       dwebp was written by the WebP team.
       The latest source tree is available at http://www.webmproject.org/code

       This manual page was written by Pascal  Massimino  <pascal.massimino@gmail.com>,  for  the
       Debian project (and may be used by others).

SEE ALSO
       cwebp(1), webpmux(1), gif2webp(1).
       Please refer to http://developers.google.com/speed/webp/ for additional information.

   Output file format details
       PAM: http://netpbm.sourceforge.net/doc/pam.html
       PGM: http://netpbm.sourceforge.net/doc/pgm.html
       PPM: http://netpbm.sourceforge.net/doc/ppm.html
       PNG: http://www.libpng.org/pub/png/png-sitemap.html#info

					February 01, 2013				 DWEBP(1)
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