cwebp-cli
Language: Russian | English
CLI tool for convert jpg/png files to webp.
Based on cwebp Encoder
How to instant use
npx @yukioru/cwebp-cli
How to install
npm install -g @yukioru/cwebp-cli
yarn global add @yukioru/cwebp-cli
How to use after install
Run cwebp in your console.
Options
-V, --version
Output the version number
-r, --recursive
Walk given directory recursively
-f, --files
Files to convert, split by ','
--lossless
Encode the image without any loss. For images with fully transparent area, the invisible pixel values (R/G/B or Y/U/V) will be preserved only if the -exact option is used
--near_lossless
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 automatically. The range is 0 (maximum preprocessing) to 100 (no preprocessing, the default). The typical value is around 60. Note that lossy with -q 100 can at times yield better results.
-q, --quality
Specify the compression factor for RGB channels between 0 and 100. The default is 75. In case of lossy compression (default), a small factor produces a smaller file with lower quality. Best quality is achieved by using a value of 100. In case of lossless compression (specified by the -lossless option), a small factor enables faster compression speed, but produces a larger file. Maximum compression is achieved by using a value of 100. (default: 75)
-z, --zip
Switch on lossless compression mode with the specified level between 0 and 9, with level 0 being the fastest, 9 being the slowest. Fast mode produces larger file size than slower ones. A good default is -z 6. This option is actually a shortcut for some predefined settings for quality and method. If options -q or -m are subsequently used, they will invalidate the effect of this option.
--alpha_q
Specify the compression factor for alpha compression between 0 and 100. Lossless compression of alpha is achieved using a value of 100, while the lower values result in a lossy compression. The default is 100.
--preset
Specify a set of pre-defined parameters to suit a particular type of source material. Possible values are: default, photo, picture, drawing, icon, text. Since -preset overwrites the other parameters values (except the -q one), this option should preferably appear first in the order of the arguments.
-m, --method
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 in faster processing time at the expense of larger file size and lower compression quality.
--resize <width/height>
Resize the source to a rectangle with size width x height. If either (but not both) of the width or height parameters is 0, the value will be calculated preserving the aspect-ratio.
--crop <x_position/y_position/width/height>
Crop the source 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.
-mt, --multithread
Use multi-threading for encoding, if possible.
--low_memory
Reduce memory usage of lossy encoding by saving four times the compressed size (typically). This will make the encoding slower and the output slightly different in size and distortion. This flag is only effective for methods 3 and up, and is off by default. Note that leaving this flag off will have some side effects on the bitstream: it forces certain bitstream features like number of partitions (forced to 1). Note that a more detailed report of bitstream size is printed by cwebp when using this option.
--size
Specify a target size (in bytes) to try and reach for the compressed output. The compressor will make several passes of partial encoding in order to get as close as possible to this target. If both -size and -psnr are used, -size value will prevail.
--psnr
Specify a target PSNR (in dB) to try and reach for the compressed output. The compressor will make several passes of partial encoding in order to get as close as possible to this target. If both -size and -psnr are used, -size value will prevail.
--pass
Set a maximum number of passes to use during the dichotomy used by options -size or -psnr. Maximum value is 10, default is 1. If options -size or -psnr were used, but -pass wasn't specified, a default value of '6' passes will be used.
-af, --autofilter
Turns auto-filter on. This algorithm will spend additional time optimizing the filtering strength to reach a well-balanced quality.
--jpeg_like
Change the internal parameter mapping to better match the expected size of JPEG compression. This flag will generally produce an output file of similar size to its JPEG equivalent (for the same -q setting), but with less visual distortion.
--filter
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.
--sharpness
Specify the sharpness of the filtering (if used). Range is 0 (sharpest) to 7 (least sharp). Default is 0.
--strong
Use strong filtering (if filtering is being used thanks to the -f option). Strong filtering is on by default.
--nostrong
Disable strong filtering (if filtering is being used thanks to the -f option) and use simple filtering instead.
--sharp_yuv
Use more accurate and sharper RGB->YUV conversion if needed. Note that this process is slower than the default 'fast' RGB->YUV conversion.
--sns
Specify the amplitude of the spatial noise shaping. Spatial noise shaping (or sns for short) refers to a general collection of built-in algorithms used to decide which area of the picture should use relatively less bits, and where else to better transfer these bits. The possible range goes from 0 (algorithm is off) to 100 (the maximal effect). The default value is 50.
--segments
Change the number of partitions to use during the segmentation of the sns algorithm. Segments should be in range 1 to 4. Default value is 4. This option has no effect for methods 3 and up, unless -low_memory is used.
--partition_limit
Degrade quality by limiting the number of bits used by some macroblocks. Range is 0 (no degradation, the default) to 100 (full degradation). Useful values are usually around 30-70 for moderately large images. In the VP8 format, the so-called control partition has a limit of 512k and is used to store the following information: whether the macroblock is skipped, which segment it belongs to, whether it is coded as intra 4x4 or intra 16x16 mode, and finally the prediction modes to use for each of the sub-blocks. For a very large image, 512k only leaves room to few bits per 16x16 macroblock. The absolute minimum is 4 bits per macroblock. Skip, segment, and mode information can use up almost all these 4 bits (although the case is unlikely), which is problematic for very large images. The partition_limit factor controls how frequently the most bit-costly mode (intra 4x4) will be used. This is useful in case the 512k limit is reached and the following message is displayed: Error code: 6 (PARTITION0_OVERFLOW: Partition #0 is too big to fit 512k). If using -partition_limit is not enough to meet the 512k constraint, one should use less segments in order to save more header bits per macroblock. See the -segments option.
-v, --verbose
Print extra information (encoding time in particular).
--print_psnr
Compute and report average PSNR (Peak-Signal-To-Noise ratio).
--print_ssim
Compute and report average SSIM (structural similarity metric, see http://en.wikipedia.org/wiki/SSIM for additional details).
--print_lsim
Compute and report local similarity metric (sum of lowest error amongst the collocated pixel neighbors).
--progress
Report encoding progress in percent.
--quiet
Do not print anything.
--short
Only print brief information (output file size and PSNR) for testing purposes.
--map
Output additional ASCII-map of encoding information. Possible map values range from 1 to 6. This is only meant to help debugging.
-s, --specify <width/height>
Specify that the input file actually consists of raw Y'CbCr samples following the ITU-R BT.601 recommendation, in 4:2:0 linear format. The luma plane has size width x height.
--pre
Specify some pre-processing steps. Using a value of 2 will trigger quality-dependent pseudo-random dithering during RGBA->YUVA conversion (lossy compression only).
--alpha_filter
Specify the predictive filtering method for the alpha plane. One of none, fast or best, in increasing complexity and slowness order. Default is fast. Internally, alpha filtering is performed using four possible predictions (none, horizontal, vertical, gradient). The best mode will try each mode in turn and pick the one which gives the smaller size. The fast mode will just try to form an a priori guess without testing all modes.
--alpha_method
Specify the algorithm used for alpha compression: 0 or 1. Algorithm 0 denotes no compression, 1 uses WebP lossless format for compression. The default is 1.
--exact
Preserve RGB values in transparent area. The default is off, to help compressibility.
--blend_alpha
This option blends the alpha channel (if present) with the source using the background color specified in hexadecimal as 0xrrggbb. The alpha channel is afterward reset to the opaque value 255.
--noalpha
Using this option will discard the alpha channel.
--hint
Specify the hint about input image type. Possible values are: photo, picture or graph.
--metadata
A comma separated list of metadata to copy from the input to the output if present. Valid values: all, none, exif, icc, xmp. The default is none. Note that each input format may not support all combinations.
--noasm
Disable all assembly optimizations.
-h, --help
Display help for command