@nwrks/webp-converter

GIF2WEBP(1) General Commands Manual GIF2WEBP(1) 1mNAME0m gif2webp - Convert a GIF image to WebP 1mSYNOPSIS0m 1mgif2webp 22m[4moptions24m] 4minput_file.gif24m 4m-o24m 4moutput_file.webp0m 1mDESCRIPTION0m This manual page documents the 1mgif2webp 22mcommand. 1mgif2webp 22mconverts a GIF image to a WebP image. 1mOPTIONS0m The basic options are: 1m-o 4m22mstring0m Specify the name of the output WebP file. If omitted, 1mgif2webp0m will perform conversion but only report statistics. Using "-" as output name will direct output to 'stdout'. 1m-- 4m22mstring0m Explicitly specify the input file. This option is useful if the input file starts with an '-' for instance. This option must ap- pear 1mlast22m. Any other options afterward will be ignored. If the input file is "-", the data will be read from 4mstdin24m instead of a file. 1m-h, -help0m Usage information. 1m-version0m Print the version number (as major.minor.revision) and exit. 1m-lossy 22mEncode the image using lossy compression. 1m-mixed 22mMixed compression mode: optimize compression of the image by picking either lossy or lossless compression for each frame heuristically. 1m-q 4m22mfloat0m Specify the compression factor for RGB channels between 0 and 100. The default is 75. In case of lossless compression (default), a small factor en- ables faster compression speed, but produces a larger file. Max- imum compression 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 quality is achieved by using a value of 100. 1m-m 4m22mint24m 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 de- cide on the quality gain. Lower value can result is faster pro- cessing time at the expense of larger file size and lower com- pression quality. 1m-min_size0m Encode image to achieve smallest size. This disables key frame insertion and picks the dispose method resulting in the smallest output for each frame. It uses lossless compression by default, but can be combined with -q, -m, -lossy or -mixed options. 1m-kmin 4m22mint0m 1m-kmax 4m22mint0m 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 values are in the range 3 to 30. Default values are kmin = 9, kmax = 17 for lossless compression and kmin = 3, kmax = 5 for lossy compression. 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 per- formance. 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 automatically. 1m-metadata 4m22mstring0m A comma separated list of metadata to copy from the input to the output if present. Valid values: 1mall22m, 1mnone22m, 1micc22m, 1mxmp22m. The de- fault is 1mxmp22m. 1m-f 4m22mint24m For lossy encoding only (specified by the -lossy option). Spec- ify the strength of the deblocking filter, between 0 (no filter- ing) 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. 1m-mt 22mUse multi-threading for encoding, if possible. 1m-loop_compatibility0m If enabled, handle the loop information in a compatible fashion for Chrome version prior to M62 (inclusive) and Firefox. 1m-v 22mPrint extra information. 1m-quiet 22mDo not print anything. 1mBUGS0m Please report all bugs to the issue tracker: https://bugs.chromium.org/p/webp Patches welcome! See this page to get started: https://www.webmpro- ject.org/code/contribute/submitting-patches/ 1mEXAMPLES0m 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 1mAUTHORS0m 1mgif2webp 22mis 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). 1mSEE ALSO0m 1mcwebp22m(1), 1mdwebp22m(1), 1mwebpmux22m(1) Please refer to https://developers.google.com/speed/webp/ for addi- tional information. November 17, 2021 GIF2WEBP(1)