webp-simple-converter

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta name="generator" content="groff -Thtml, see www.gnu.org"> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <meta name="Content-Style" content="text/css"> <style type="text/css"> p { margin-top: 0; margin-bottom: 0; vertical-align: top } pre { margin-top: 0; margin-bottom: 0; vertical-align: top } table { margin-top: 0; margin-bottom: 0; vertical-align: top } h1 { text-align: center } </style> <title>DWEBP</title> </head> <body> <h1 align="center">DWEBP</h1> <a href="#NAME">NAME</a> <a href="#SYNOPSIS">SYNOPSIS</a> <a href="#DESCRIPTION">DESCRIPTION</a> <a href="#OPTIONS">OPTIONS</a> <a href="#BUGS">BUGS</a> <a href="#EXAMPLES">EXAMPLES</a> <a href="#AUTHORS">AUTHORS</a> <a href="#SEE ALSO">SEE ALSO</a> <hr> <h2>NAME <a name="NAME"></a> </h2> dwebp - decompress a WebP file to an image file <h2>SYNOPSIS <a name="SYNOPSIS"></a> </h2> dwebp [options] input_file.webp <h2>DESCRIPTION <a name="DESCRIPTION"></a> </h2> This manual page documents the dwebp command. dwebp decompresses WebP files into PNG, PAM, PPM or PGM images. <h2>OPTIONS <a name="OPTIONS"></a> </h2> The basic options are: <table width="100%" border="0" rules="none" frame="void" cellspacing="0" cellpadding="0"> <tr valign="top" align="left"> <td width="11%"></td> <td width="3%"> -h</td> <td width="8%"></td> <td width="30%"> Print usage summary.</td> <td width="48%"> </td></tr> </table> -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). Using "-" as output name will direct output to ’stdout’. -- string Explicitly specify the input file. This option is useful if the input file starts with an ’-’ for instance. This option must appear last. Any other options afterward will be ignored. If the input file is "-", the data will be read from stdin instead of a file. <table width="100%" border="0" rules="none" frame="void" cellspacing="0" cellpadding="0"> <tr valign="top" align="left"> <td width="11%"></td> <td width="7%"> -bmp</td> <td width="4%"></td> <td width="78%"> Change the output format to uncompressed BMP.</td></tr> <tr valign="top" align="left"> <td width="11%"></td> <td width="7%"> -tiff</td> <td width="4%"></td> <td width="78%"> Change the output format to uncompressed TIFF.</td></tr> <tr valign="top" align="left"> <td width="11%"></td> <td width="7%"> -pam</td> <td width="4%"></td> <td width="78%"> Change the output format to PAM (retains alpha).</td></tr> <tr valign="top" align="left"> <td width="11%"></td> <td width="7%"> -ppm</td> <td width="4%"></td> <td width="78%"> Change the output format to PPM (discards alpha).</td></tr> <tr valign="top" align="left"> <td width="11%"></td> <td width="7%"> -pgm</td> <td width="4%"></td> <td width="78%"> 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. </td></tr> <tr valign="top" align="left"> <td width="11%"></td> <td width="7%"> -yuv</td> <td width="4%"></td> <td width="78%"> 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.</td></tr> </table> -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 it will make the decoding faster. -dither strength Specify a dithering strength 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. -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. -nodither Disable all dithering (default). <table width="100%" border="0" rules="none" frame="void" cellspacing="0" cellpadding="0"> <tr valign="top" align="left"> <td width="11%"></td> <td width="4%"> -mt</td> <td width="7%"></td> <td width="70%"> Use multi-threading for decoding, if possible.</td> <td width="8%"> </td></tr> </table> -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. <table width="100%" border="0" rules="none" frame="void" cellspacing="0" cellpadding="0"> <tr valign="top" align="left"> <td width="11%"></td> <td width="7%"> -flip</td> <td width="4%"></td> <td width="78%"> Flip decoded image vertically (can be useful for OpenGL textures for instance).</td></tr> </table> -resize, -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. If either (but not both) of the width or height parameters is 0, the value will be calculated preserving the aspect-ratio. <table width="100%" border="0" rules="none" frame="void" cellspacing="0" cellpadding="0"> <tr valign="top" align="left"> <td width="11%"></td> <td width="9%"> -quiet</td> <td width="2%"></td> <td width="78%"> Do not print anything.</td></tr> <tr valign="top" align="left"> <td width="11%"></td> <td width="9%"> -v</td> <td width="2%"></td> <td width="78%"> Print extra information (decoding time in particular). </td></tr> <tr valign="top" align="left"> <td width="11%"></td> <td width="9%"> -noasm</td> <td width="2%"></td> <td width="78%"> Disable all assembly optimizations.</td></tr> </table> <h2>BUGS <a name="BUGS"></a> </h2> Please report all bugs to the issue tracker: https://bugs.chromium.org/p/webp Patches welcome! See this page to get started: http://www.webmproject.org/code/contribute/submitting-patches/ <h2>EXAMPLES <a name="EXAMPLES"></a> </h2> dwebp picture.webp -o output.png dwebp picture.webp -ppm -o output.ppm dwebp -o output.ppm -- ---picture.webp cat picture.webp | dwebp -o - -- - > output.ppm <h2>AUTHORS <a name="AUTHORS"></a> </h2> dwebp is a part of libwebp and was written by the WebP team. The latest source tree is available at https://chromium.googlesource.com/webm/libwebp This manual page was written by Pascal Massimino <pascal.massimino@gmail.com>, for the Debian project (and may be used by others). <h2>SEE ALSO <a name="SEE ALSO"></a> </h2> cwebp(1), gif2webp(1), webpmux(1) Please refer to http://developers.google.com/speed/webp/ for additional information. Output file format details PAM: http://netpbm.sourceforge.net/doc/pam.html PGM: http://netpbm.sourceforge.net/doc/pgm.html PPM: http://netpbm.sourceforge.net/doc/ppm.html PNG: http://www.libpng.org/pub/png/png-sitemap.html#info <hr> </body> </html>