Visit The New, Modern Unix Linux Community

Linux and UNIX Man Pages

Test Your Knowledge in Computers #476
Difficulty: Medium
A Zettabyte (ZB) is 1,180,591,620,717,411,303,424 bytes.
True or False?
Linux & Unix Commands - Search Man Pages

dwebp(1) [centos man page]

DWEBP(1)						      General Commands Manual							  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-compli- ant 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 cropping large images. Note: the cropping is applied before any scal- ing. -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 cropping. -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/contribute/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)

Check Out this Related Man Page

DWEBP(1)						      General Commands Manual							  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, 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). -ppm Change the output format to PPM. -pgm Change the output format to PGM. The output consist of luma/chroma samples instead of RGB, using the ICM4 layout. This option is mainly for verification and debugging purpose. -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-compli- ant 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 cropping large images. Note: the cropping is applied before any scal- ing. -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 cropping. -v Print extra information (decoding time in particular). -noasm Disable all assembly optimizations. Examples: dwebp picture.webp -o output.png dwebp picture.webp -ppm -o output.ppm SEE ALSO
cwebp(1). Please refer to http://code.google.com/speed/webp/ for additional information. AUTHOR
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). September 19, 2011 DWEBP(1)

Featured Tech Videos