gif2webp(1) [centos man page]
GIF2WEBP(1) General Commands Manual GIF2WEBP(1) NAME
gif2webp - Convert a GIF image to WebP SYNOPSIS
gif2webp [options] input_file.gif -o output_file.webp DESCRIPTION
This manual page documents the gif2webp command. gif2webp converts a GIF image to a WebP image. OPTIONS
The basic options are: -o string Specify the name of the output WebP file. If omitted, gif2webp will perform conversion but only report statistics. -h, -help Usage information. -version Print the version number (as major.minor.revision) and exit. -lossy Encode the image using lossy compression. -q float Specify the compression factor for RGB channels between 0 and 100. The default is 75. In case of lossless compression (default), a small factor enables faster compression speed, but produces a larger file. Maximum com- pression is achieved by using a value of 100. In case of lossy compression (specified by the -lossy option), a small factor produces a smaller file with lower quality. Best qual- ity is achieved by using a value of 100. -m int Specify the compression method to use. This parameter controls the trade off between encoding speed and the compressed file size and quality. Possible values range from 0 to 6. Default value is 4. When higher values are used, the encoder will spend more time inspecting additional encoding possibilities and decide on the quality gain. Lower value can result is faster processing time at the expense of larger file size and lower compression quality. -f int For lossy encoding only (specified by the -lossy option). Specify the strength of the deblocking filter, between 0 (no filtering) and 100 (maximum filtering). A value of 0 will turn off any filtering. Higher value will increase the strength of the filtering process applied after decoding the picture. The higher the value the smoother the picture will appear. Typical values are usually in the range of 20 to 50. -v Print extra information. -quiet Do not print anything. BUGS
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/ EXAMPLES
gif2webp picture.gif -o picture.webp gif2webp -q 70 picture.gif -o picture.webp gif2webp -lossy -m 3 picture.gif -o picture_lossy.webp gif2webp -lossy -f 50 picture.gif -o picture.webp AUTHORS
gif2webp was written by the WebP team. The latest source tree is available at http://www.webmproject.org/code This manual page was written by Urvang Joshi <urvang@google.com>, for the Debian project (and may be used by others). SEE ALSO
dwebp(1), cwebp(1), webpmux(1). Please refer to http://developers.google.com/speed/webp/ for additional information. February 01, 2013 GIF2WEBP(1)
Check Out this Related Man Page
DWEBP(1) General Commands Manual DWEBP(1) NAME
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, 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 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. -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. BUGS
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/ EXAMPLES
dwebp picture.webp -o output.png dwebp picture.webp -ppm -o output.ppm AUTHORS
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 <pascal.massimino@gmail.com>, for the Debian project (and may be used by others). SEE ALSO
cwebp(1), webpmux(1), gif2webp(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 February 01, 2013 DWEBP(1)