WebP 图片转换

sudo apt-get update
sudo apt-get install webp 

cwebp -q 85 -resize 300 200  aa.jpg -o bb.webp

cwebp -q [质量] -resize [宽] [高]  [原图片] -o [输出文件]

> cwebp -longhelp

Usage:
 cwebp [-preset <...>] [options] in_file [-o out_file]

If input size (-s) for an image is not specified, it is
assumed to be a PNG, JPEG, TIFF or WebP file.

Options:
  -h / -help ............. short help
  -H / -longhelp ......... long help
  -q <float> ............. quality factor (0:small..100:big), default=75
  -alpha_q <int> ......... transparency-compression quality (0..100),
                           default=100
  -preset <string> ....... preset setting, one of:
                            default, photo, picture,
                            drawing, icon, text
     -preset must come first, as it overwrites other parameters
  -z <int> ............... activates lossless preset with given
                           level in [0:fast, ..., 9:slowest]

  -m <int> ............... compression method (0=fast, 6=slowest), default=4
  -segments <int> ........ number of segments to use (1..4), default=4
  -size <int> ............ target size (in bytes)
  -psnr <float> .......... target PSNR (in dB. typically: 42)

  -s <int> <int> ......... input size (width x height) for YUV
  -sns <int> ............. spatial noise shaping (0:off, 100:max), default=50
  -f <int> ............... filter strength (0=off..100), default=60
  -sharpness <int> ....... filter sharpness (0:most .. 7:least sharp), default=0
  -strong ................ use strong filter instead of simple (default)
  -nostrong .............. use simple filter instead of strong
  -sharp_yuv ............. use sharper (and slower) RGB->YUV conversion
  -partition_limit <int> . limit quality to fit the 512k limit on
                           the first partition (0=no degradation ... 100=full)
  -pass <int> ............ analysis pass number (1..10)
  -crop <x> <y> <w> <h> .. crop picture with the given rectangle
  -resize <w> <h> ........ resize picture (after any cropping)
  -mt .................... use multi-threading if available
  -low_memory ............ reduce memory usage (slower encoding)
  -map <int> ............. print map of extra info
  -print_psnr ............ prints averaged PSNR distortion
  -print_ssim ............ prints averaged SSIM distortion
  -print_lsim ............ prints local-similarity distortion
  -d <file.pgm> .......... dump the compressed output (PGM file)
  -alpha_method <int> .... transparency-compression method (0..1), default=1
  -alpha_filter <string> . predictive filtering for alpha plane,
                           one of: none, fast (default) or best
  -exact ................. preserve RGB values in transparent area, default=off
  -blend_alpha <hex> ..... blend colors against background color
                           expressed as RGB values written in
                           hexadecimal, e.g. 0xc0e0d0 for red=0xc0
                           green=0xe0 and blue=0xd0
  -noalpha ............... discard any transparency information
  -lossless .............. encode image losslessly, default=off
  -near_lossless <int> ... use near-lossless image
                           preprocessing (0..100=off), default=100
  -hint <string> ......... specify image characteristics hint,
                           one of: photo, picture or graph

  -metadata <string> ..... comma separated list of metadata to
                           copy from the input to the output if present.
                           Valid values: all, none (default), exif, icc, xmp

  -short ................. condense printed message
  -quiet ................. don't print anything
  -version ............... print version number and exit
  -noasm ................. disable all assembly optimizations
  -v ..................... verbose, e.g. print encoding/decoding times
  -progress .............. report encoding progress

Experimental Options:
  -jpeg_like ............. roughly match expected JPEG size
  -af .................... auto-adjust filter strength
  -pre <int> ............. pre-processing filter

dwebp bb.webp -o cc.png

dwebp [原图片] -o [输出文件]

> dwebp -h

Usage: dwebp in_file [options] [-o out_file]

Decodes the WebP image file to PNG format [Default]
Use following options to convert into alternate image formats:
  -pam ......... save the raw RGBA samples as a color PAM
  -ppm ......... save the raw RGB samples as a color PPM
  -bmp ......... save as uncompressed BMP format
  -tiff ........ save as uncompressed TIFF format
  -pgm ......... save the raw YUV samples as a grayscale PGM
                 file with IMC4 layout
  -yuv ......... save the raw YUV samples in flat layout

 Other options are:
  -version ..... print version number and exit
  -nofancy ..... don't use the fancy YUV420 upscaler
  -nofilter .... disable in-loop filtering
  -nodither .... disable dithering
  -dither <d> .. dithering strength (in 0..100)
  -alpha_dither  use alpha-plane dithering if needed
  -mt .......... use multi-threading
  -crop <x> <y> <w> <h> ... crop output with the given rectangle
  -resize <w> <h> ......... scale the output (*after* any cropping)
  -flip ........ flip the output vertically
  -alpha ....... only save the alpha plane
  -incremental . use incremental decoding (useful for tests)
  -h ........... this help message
  -v ........... verbose (e.g. print encoding/decoding times)
  -quiet ....... quiet mode, don't print anything

vwebp bb.webp

> vwebp -h

Usage: vwebp in_file [options]

Decodes the WebP image file and visualize it using OpenGL
Options are:
  -version ..... print version number and exit
  -noicc ....... don't use the icc profile if present
  -nofancy ..... don't use the fancy YUV420 upscaler
  -nofilter .... disable in-loop filtering
  -dither <int>  dithering strength (0..100), default=50
  -noalphadither disable alpha plane dithering
  -usebgcolor .. display background color
  -mt .......... use multi-threading
  -info ........ print info
  -h ........... this help message

Keyboard shortcuts:
  'c' ................ toggle use of color profile
  'b' ................ toggle background color display
  'i' ................ overlay file information
  'd' ................ disable blending & disposal (debug)
  'q' / 'Q' / ESC .... quit

img2webp  -loop 0 -lossy -d 1000 a.jpg -d 1500 b.png -d 2000 c.jpg -o out.webp

img2webp  -loop [循环次数] -d [间隔时间] [原文件1] -d [间隔时间] [原文件2] -d [间隔时间] [原文件3] -o [目标文件]

> img2webp -h

Usage:

  img2webp [file-level options] [image files...] [per-frame options...]

File-level options (only used at the start of compression):
 -min_size ............ minimize size
 -loop <int> .......... loop count (default: 0, = infinite loop)
 -kmax <int> .......... maximum number of frame between key-frames
                        (0=only keyframes)
 -kmin <int> .......... minimum number of frame between key-frames
                        (0=disable key-frames altogether)
 -mixed ............... use mixed lossy/lossless automatic mode
 -v ................... verbose mode
 -h ................... this help
 -version ............. print version number and exit

Per-frame options (only used for subsequent images input):
 -d <int> ............. frame duration in ms (default: 100)
 -lossless  ........... use lossless mode (default)
 -lossy ... ........... use lossy mode
 -q <float> ........... quality
 -m <int> ............. method to use

gif2webp giphy.gif -o giphy.webp

> gif2webp -h

Usage:
 gif2webp [options] gif_file -o webp_file
Options:
  -h / -help ............. this help
  -lossy ................. encode image using lossy compression
  -mixed ................. for each frame in the image, pick lossy
                           or lossless compression heuristically
  -q <float> ............. quality factor (0:small..100:big)
  -m <int> ............... compression method (0=fast, 6=slowest)
  -min_size .............. minimize output size (default:off)
                           lossless compression by default; can be
                           combined with -q, -m, -lossy or -mixed
                           options
  -kmin <int> ............ min distance between key frames
  -kmax <int> ............ max distance between key frames
  -f <int> ............... filter strength (0=off..100)
  -metadata <string> ..... comma separated list of metadata to
                           copy from the input to the output if present
                           Valid values: all, none, icc, xmp (default)
  -loop_compatibility .... use compatibility mode for Chrome
                           version prior to M62 (inclusive)
  -mt .................... use multi-threading if available

  -version ............... print version number and exit
  -v ..................... verbose
  -quiet ................. don't print anything