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dwebp(1) [debian man page]

DWEBP(1)						      General Commands Manual							  DWEBP(1)

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 for additional information. AUTHOR
dwebp was written by the WebP team. The latest source tree is available at This manual page was written by Pascal Massimino <>, 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)

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)
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