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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. Using "-" as output name will direct output to 'stdout'. -- string Explicitly specify the input file. This option is useful if the in- put 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. -h, -help Usage information. -version Print the version number (as major.minor.revision) and exit. -lossy Encode the image using lossy compression. -mixed Mixed compression mode: optimize compression of the image by picking either lossy or lossless compression for each frame heuristically. -near_lossless int Specify the level of near-lossless image preprocessing. This option adjusts pixel values to help compressibility, but has minimal impact on the visual quality. It triggers lossless compression mode auto- matically. The range is 0 (maximum preprocessing) to 100 (no prepro- cessing, the default). The typical value is around 60. Note that lossy with -q 100 can at times yield better results. -sharp_yuv Use more accurate and sharper RGB->YUV conversion. Note that this process is slower than the default 'fast' RGB->YUV conversion. -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 in- specting additional encoding possibilities and decide on the quality gain. Lower value can result is faster processing time at the ex- pense of larger file size and lower compression quality. -min_size Encode image to achieve smallest size. This disables key frame in- sertion and picks the dispose method resulting in the smallest out- put for each frame. It uses lossless compression by default, but can be combined with -q, -m, -lossy or -mixed options. -kmin int -kmax int Specify the minimum and maximum distance between consecutive key frames (independently decodable frames) in the output animation. The tool will insert some key frames into the output animation as needed so that this criteria is satisfied. A 'kmax' value of 0 will turn off insertion of key frames. A 'kmax' value of 1 will result in all frames being key frames. 'kmin' value is not taken into account in both these special cases. Typical val- ues are in the range 3 to 30. Default values are kmin = 9, kmax = 17 for lossless compression and kmin = 3, kmax = 5 for lossy compres- sion. These two options are relevant only for animated images with large number of frames (>50). When lower values are used, more frames will be converted to key frames. This may lead to smaller number of frames required to decode a frame on average, thereby improving the decoding performance. But this may lead to slightly bigger file sizes. Higher values may lead to worse decoding performance, but smaller file sizes. Some restrictions: (i) kmin < kmax, (ii) kmin >= kmax / 2 + 1 and (iii) kmax - kmin <= 30. If any of these restrictions are not met, they will be enforced au- tomatically. -metadata string A comma separated list of metadata to copy from the input to the output if present. Valid values: all, none, icc, xmp. The default is xmp. -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 ap- plied 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. -mt Use multi-threading for encoding, if possible. -loop_compatibility If enabled, handle the loop information in a compatible fashion for Chrome version prior to M62 (inclusive) and Firefox. -v Print extra information. -quiet Do not print anything. EXIT STATUS If there were no problems during execution, gif2webp exits with the value of the C constant EXIT_SUCCESS. This is usually zero. If an error occurs, gif2webp exits with the value of the C constant EXIT_FAILURE. This is usually one. 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 gif2webp -q 70 -o picture.webp -- ---picture.gif cat picture.gif | gif2webp -o - -- - > output.webp AUTHORS gif2webp is a part of libwebp and was written by the WebP team. The latest source tree is available at https://chromium.google- source.com/webm/libwebp This manual page was written by Urvang Joshi <urvang@google.com>, for the Debian project (and may be used by others). REPORTING BUGS Please report all bugs to the issue tracker: https://issues.webmproject.org Patches welcome! See this page to get started: https://www.webmpro- ject.org/code/contribute/submitting-patches/ SEE ALSO cwebp(1), dwebp(1), webpmux(1) Please refer to https://developers.google.com/speed/webp/ for additional information. November 4, 2024 GIF2WEBP(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXIT STATUS | EXAMPLES | AUTHORS | REPORTING BUGS | SEE ALSO
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