Pictures, thanks to the -f option of the cwebp tool. Thus, we explicitely specified the target sizes for each pictures.Īdditionally, we set ad-hoc values for the filtering strength for each We targeted a 30% file size reduction compared to the optimized JPEG files. Which produces optimized JPEG files with a quality factor of 80. The complete conversion sequence is then: convert in.png tmp.ppmĬjpeg -optimize -quality 80 -outfile out.jpg tmp.ppm JPEG's encoder ( cjpeg) takes input images in PPM format. To produce the final set of source PNG images. Using the following command: convert in.png -depth 16 -gamma 0.454545 -filter lanczos -resize 1024 -gamma 2.2 -depth 8 out.png Then, the large source images are rescaled to a smaller width of 1024 pixels Lane, Guido Vollbedingįirst, the JPEG sources are converted losslessly to PNG format simply using: convert in.jpg out.png The version information reads: Independent JPEG Group's CJPEG, version 8b 1Ĭopyright (C) 2010, Thomas G. The version information reads: Version: ImageMagick 6.5.7-8 Q16 įor JPEG compression, we used the version 8b of IJG's reference encoder, ImageMagick's tool named convert, available at. To convert and rescale the source pictures, we used a recent version of Image: Fire breathing 'Jaipur Maharaja Brass Band' Chassepierre Belgiumįor the sake of reproducibility and to demonstrate the use of some WebPĬompression parameters, we describe here the exact steps involved when Image: 'A Wild Cherry (Prunus avium) in flower'Īttribution-Share Alike 3.0 Unported license. Image Producer: Lars Haglund, SVT Sveriges Television AB Reproduced with permission of the author.īlog post by author with comparison of JPEG and WebP. 'Nærøyfjorden, Norway - from Breiskrednosi. Selected some delightful and rich pictures to showcase qualities of WebP.įamous classic images such as Lena, the Baboon, etc., often used when doingĬompression comparisons, are unfortunately not free of copyright.Ĭredits for the images above are listed here in order. The images on this page come from a number of different sources. Image: Fire breathing 'Jaipur Maharaja Brass Band' Chassepierre Belgium 5 Image: 'A Wild Cherry (Prunus avium) in flower' 4 'Kayaker at Ekstremsportveko 2010, Voss'.

The WebP images are more than 30% smaller Clicking on the JPEG and WebP thumbnails will open theįile sizes below the thumbnails correspond to the files sizes of the images We no longer place WebP images in a PNG container as we did at launch. Since browsers exist that support WebP natively, The table below shows scaled JPEG (on the left) and WebP images (on the right) Sample Image Files in JPEG and WebP and the PNG Source Local drive to use with other products that If you don't have access to Google Chrome, you may download the images on your This gallery page is best viewed with a browser that supports WebP, such as

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