CentOS 7.0 - man page for dwebp (centos section 1)

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DWEBP(1)										 DWEBP(1)

       dwebp - decompress a WebP file to an image file

       dwebp [options] input_file.webp

       This manual page documents the dwebp command.

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

       The basic options are:

       -h     Print usage summary.

	      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

       -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.

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

	      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-

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

       -noasm Disable all assembly optimizations.

       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-

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

       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).

       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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