![]() ![]() ![]() webp file and decode it to a PNG image file (amongst other formats). There is a decoding sample in examples/dwebp.c which will take a. A lower value will result in faster encoding at the expense of quality. You can try -m 5 or -m 6 to explore more (time-consuming) encoding possibilities. m controls the trade-off between encoding speed and quality.Note that using the option -strong/-nostrong will change the type of filtering. This is particularly useful when aiming at very small files. The higher the value, the smoother the highly-compressed area will look. f option directly links to the filtering strength used by the codec's in-loop processing.Usually, raising the sns value (at fixed -q value) leads to larger files, but with better quality. It tries to take bits from the “easy” parts of the picture and use them in the “difficult” ones instead. This option will balance the bit allocation differently. sns will progressively turn on (when going from 0 to 100) some additional visual optimizations (like: segmentation map re-enforcement).It should appear first in the list of options, so that subsequent options can take effect on top of this preset. preset will set up a default encoding configuration targeting a particular type of input.The main options you might want to try in order to further tune the visual quality are: report encoding progressĮxperimental Options: -jpeg_like. Valid values: all, none (default), exif, icc, xmp comma separated list of metadata toĬopy from the input to the output if present. preserve RGB values in transparent area, default=off transparency-compression method (0.1), default=1 use sharper (and slower) RGB->YUV conversion use strong filter instead of simple (default) spatial noise shaping (0:off, 100:max), default=50 number of segments to use (1.4), default=4 compression method (0=fast, 6=slowest), default=4 preset must come first, as it overwrites other parameters transparency-compression quality (0.100), quality factor (0:small.100:big), default=75 Note: Animated PNG and WebP files are not supported. If input size (-s) for an image is not specified, it is assumed to be a PNG, JPEG, TIFF or WebP file. The -q quality parameter will in this case control the amount of processing time spent trying to make the output file as small as possible.Ī longer list of options is available using the -longhelp command line flag: > cwebp - longhelpĬwebp in_file You might want to try the -lossless flag too, which will compress the source (in RGBA format) without any loss. Which will convert the input file to a WebP file using a quality factor of 80 on a 0->100 scale (0 being the lowest quality, 100 being the best. The easiest use should look like: cwebp input. The examples/ directory contains tools for encoding (cwebp) and decoding (dwebp) images. ![]()
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