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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)

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WEBPMUX(1)						      General Commands Manual							WEBPMUX(1)

NAME
webpmux - command line tool to create WebP Mux/container file. SYNOPSIS
webpmux -get GET_OPTIONS INPUT -o OUTPUT webpmux -set SET_OPTIONS INPUT -o OUTPUT webpmux -strip STRIP_OPTIONS INPUT -o OUTPUT webpmux -frame FRAME_OPTIONS [ -frame ... ] [ -loop LOOP_COUNT ] [ -bgcolor BACKGROUND_COLOR ] -o OUTPUT webpmux -info INPUT webpmux [-h|-help] webpmux -version DESCRIPTION
This manual page documents the webpmux command. webpmux can be used to create a WebP container file and extract/strip relevant data from the container file. OPTIONS
GET_OPTIONS (-get): icc Get ICC profile. exif Get EXIF metadata. xmp Get XMP metadata. frame n Get nth frame. SET_OPTIONS (-set) icc file.icc Set ICC profile. Where: 'file.icc' contains the ICC profile to be set. exif file.exif Set EXIF metadata. Where: 'file.exif' contains the EXIF metadata to be set. xmp file.xmp Set XMP metadata. Where: 'file.xmp' contains the XMP metadata to be set. STRIP_OPTIONS (-strip) icc Strip ICC profile. exif Strip EXIF metadata. xmp Strip XMP metadata. FRAME_OPTIONS (-frame) file_i +di[+xi+yi[+mi]] Where: 'file_i' is the i'th frame (WebP format), 'xi','yi' specify the image offset for this frame, 'di' is the pause duration before next frame and 'mi' is the dispose method for this frame (0 for NONE or 1 for BACKGROUND). Additionally, if 'mi' is ommitted then'xi' and 'yi' can be omitted and will default to +0+0. -loop n Loop the frames n number of times. 0 indicates the frames should loop forever. Valid range is 0 to 65535 [Default: 0 (infinite)]. -bgcolor A,R,G,B Background color of the canvas. where: 'A', 'R', 'G' and 'B' are integers in the range 0 to 255 specifying the Alpha, Red, Green and Blue component values respec- tively [Default: 255,255,255,255]. INPUT Input file in WebP format. OUTPUT (-o) Output file in WebP format. Note: The nature of EXIF, XMP and ICC data is not checked and is assumed to be valid. 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
webpmux -set icc image_profile.icc in.webp -o icc_container.webp webpmux -get icc icc_container.webp -o image_profile.icc webpmux -strip icc icc_container.webp -o without_icc.webp webpmux -set xmp image_metadata.xmp in.webp -o xmp_container.webp webpmux -get xmp xmp_container.webp -o image_metadata.xmp webpmux -strip xmp xmp_container.webp -o without_xmp.webp webpmux -set exif image_metadata.exif in.webp -o exif_container.webp webpmux -get exif exif_container.webp -o image_metadata.exif webpmux -strip exif exif_container.webp -o without_exif.webp webpmux -frame anim_1.webp +100 -frame anim_2.webp +100+50+50 -loop 10 -bgcolor 255,255,255,255 -o anim_container.webp webpmux -get frame 2 anim_container.webp -o frame_2.webp AUTHORS
webpmux is written by the WebP team. The latest source tree is available at http://www.webmproject.org/code This manual page was written by Vikas Arora <vikaas.arora@gmail.com>, for the Debian project (and may be used by others). SEE ALSO
dwebp(1), cwebp(1), gif2webp(1). Please refer to http://developers.google.com/speed/webp/ for additional information. March 16, 2013 WEBPMUX(1)

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