Name
dwebp - decompress a WebP file to an image file
Synopsis
dwebp input_file.webp [options] [-o output_file]
Description
This page documents the dwebp command.
dwebp decompresses WebP files into PNG (default),
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 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-compliant 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 scaling.
-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
Output file format details