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'\" te .\" Hey, EMACS: -*- nroff -*- .TH DWEBP 1 "November 17, 2021" .SH NAME dwebp \- decompress a WebP file to an image file .SH SYNOPSIS .B dwebp .RI [ options ] " input_file.webp .br .SH DESCRIPTION This manual page documents the .B dwebp command. .PP \fBdwebp\fP decompresses WebP files into PNG, PAM, PPM or PGM images. Note: Animated WebP files are not supported. .SH OPTIONS The basic options are: .TP .B \-h Print usage summary. .TP .B \-version Print the version number (as major.minor.revision) and exit. .TP .BI \-o " string Specify the name of the output file (as PNG format by default). Using "-" as output name will direct output to 'stdout'. .TP .BI \-\- " string Explicitly specify the input file. This option is useful if the input file starts with an '\-' for instance. This option must appear \fBlast\fP. Any other options afterward will be ignored. If the input file is "\-", the data will be read from \fIstdin\fP instead of a file. .TP .B \-bmp Change the output format to uncompressed BMP. .TP .B \-tiff Change the output format to uncompressed TIFF. .TP .B \-pam Change the output format to PAM (retains alpha). .TP .B \-ppm Change the output format to PPM (discards alpha). .TP .B \-pgm Change the output format to PGM. The output consists of luma/chroma samples instead of RGB, using the IMC4 layout. This option is mainly for verification and debugging purposes. .TP .B \-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. .TP .B \-nofancy Don't use the fancy upscaler for YUV420. This may lead to jaggy edges (especially the red ones), but should be faster. .TP .B \-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 it will make the decoding faster. .TP .BI \-dither " strength Specify a dithering \fBstrength\fP between 0 and 100. Dithering is a post-processing effect applied to chroma components in lossy compression. It helps by smoothing gradients and avoiding banding artifacts. .TP .BI \-alpha_dither If the compressed file contains a transparency plane that was quantized during compression, this flag will allow dithering the reconstructed plane in order to generate smoother transparency gradients. .TP .B \-nodither Disable all dithering (default). .TP .B \-mt Use multi-threading for decoding, if possible. .TP .BI \-crop " x_position y_position width height Crop the decoded picture to a rectangle with top-left corner at coordinates (\fBx_position\fP, \fBy_position\fP) and size \fBwidth\fP x \fBheight\fP. 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 \fIbefore\fP any scaling. .TP .B \-flip Flip decoded image vertically (can be useful for OpenGL textures for instance). .TP \fB\-resize\fR, \fB\-scale\fI width height\fR Rescale the decoded picture to dimension \fBwidth\fP x \fBheight\fP. 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 \fIafter\fP cropping. If either (but not both) of the \fBwidth\fP or \fBheight\fP parameters is 0, the value will be calculated preserving the aspect-ratio. .TP .B \-quiet Do not print anything. .TP .B \-v Print extra information (decoding time in particular). .TP .B \-noasm Disable all assembly optimizations. .SH BUGS Please report all bugs to the issue tracker: https://bugs.chromium.org/p/webp .br Patches welcome! See this page to get started: https://www.webmproject.org/code/contribute/submitting\-patches/ .SH EXAMPLES dwebp picture.webp \-o output.png .br dwebp picture.webp \-ppm \-o output.ppm .br dwebp \-o output.ppm \-\- \-\-\-picture.webp .br cat picture.webp | dwebp \-o \- \-\- \- > output.ppm .SH AUTHORS \fBdwebp\fP is a part of libwebp and was written by the WebP team. .br The latest source tree is available at https://chromium.googlesource.com/webm/libwebp .PP This manual page was written by Pascal Massimino <pascal.massimino@gmail.com>, for the Debian project (and may be used by others). .\" Oracle has added the ARC stability level to this manual page .SH ATTRIBUTES See .BR attributes (7) for descriptions of the following attributes: .sp .TS box; cbp-1 | cbp-1 l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE = Availability image/library/libwebp = Stability Pass-through volatile .TE .PP .SH SEE ALSO .BR cwebp (1), .BR gif2webp (1), .BR webpmux (1) .br Please refer to https://developers.google.com/speed/webp/ for additional information. .SS Output file format details PAM: http://netpbm.sourceforge.net/doc/pam.html .br PGM: http://netpbm.sourceforge.net/doc/pgm.html .br PPM: http://netpbm.sourceforge.net/doc/ppm.html .br PNG: http://www.libpng.org/pub/png/png-sitemap.html#info .SH NOTES .\" Oracle has added source availability information to this manual page Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source-code-downloads.html. This software was built from source available at https://github.com/oracle/solaris-userland. The original community source was downloaded from http://downloads.webmproject.org/releases/webp/libwebp-1.3.2.tar.gz. Further information about this software can be found on the open source community website at https://www.webmproject.org/.