DWEBP(1) General Commands Manual 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.
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.
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-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-
-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.
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/
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 <email@example.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
February 01, 2013 DWEBP(1)