dwebp(1) [debian 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)

Check Out this Related Man Page

pamdice(1)                                                    General Commands Manual                                                   pamdice(1)

NAME

       pamdice - slice a Netpbm image into many horizontally and/or vertically

SYNOPSIS

       pamslice -outstem=filenamestem [-width=width] [-height=height] [-verbose] [filename]

       You  can use the minimum unique abbreviation of the options.  You can use two hyphens instead of one.  You can separate an option name from
       its value with white space instead of an equals sign.

DESCRIPTION

       Reads a PAM, PBM, PGM, or PPM image as input.  Splits it horizontally and/or vertically into equal size pieces and writes them  into  sepa-
       rate files as the same kind of image.

       See the -outstem option for information on naming of the output files.

       The -width and -height options determine the size of the output pieces.

       pnmcat can rejoin the images.

OPTIONS

       -outstem=filenamestem
              This  option  determines  the  names of the output files.  Each output file is named filenamestem_y_x.type where filenamestem is the
              value of the -outstem option, x and y are the horizontal and vertical locations, respectively, in the  input  image  of  the  output
              image, zero being the leftmost and top, and type is .pbm, .pgm, .ppm, or .pam, depending on the type of image.

       -width=width
              gives  the width in pixels of the output images.  The rightmost pieces are smaller than this if the input image is not a multiple of
              width pixels wide.

       -height=height
              gives the height in pixels of the output images.  The bottom pieces are smaller than this if the input image is not  a  multiple  of
              height pixels high.

       -verbose
              Print information about the processing to Standard Error.

SEE ALSO

       pamcut(1), pnmcat(1), pgmslice(1), pnm(5)

AUTHOR

       put by Bryan Henderson in the public domain in 2001

                                                                  31 January 2001                                                       pamdice(1)

Linux and UNIX Man Pages

dwebp(1) [debian man page]

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