mozjpeg Reviews and Details

Social recommendations and mentions

• Every JPEG Is a Model of Your Retina

  A widely-noted footnote in the JPEG specification is that Annex K, which contains the example quantization tables, presents them as illustrative rather than as defaults. Every encoder is permitted to substitute its own. MozJPEG takes that permission seriously and computes per-image quantization tables, spending CPU at encode time to fit the perceptual model more tightly to the specific photograph. The quality at a... - Source: dev.to / 4 months ago

• Lazy Loading, Code Splitting, and Image Optimization for SaaS Applications

  Optimize images at every step: Compress with mozjpeg/ pngquant, resize to actual display dimensions, serve progressive JPEGs, and use CDNs with on-the-fly optimization (Cloudinary, imgix). - Source: dev.to / 4 months ago

• Scripts I wrote that I use all the time

  Nice. I have a command similar to the one listed "removeexif" called prep_for_web which takes any image file (PNG, BMP, JPG, WebP), scrubs EXIF data, checks for transparency and then compresses it to either JPG using MozJPEG or to PNG using PNGQuant. [1] https://github.com/mozilla/mozjpeg [2] https://pngquant.org. - Source: Hacker News / 10 months ago

• It's the future – you can stop using JPEGs

  It would be nice if the author would add mozjpeg[1] to the comparison. At certain sizes, it can produce smaller sizes than WebP, and because it is still a jpeg, it has a much better compatibility story, which the author alluded to. [1]https://github.com/mozilla/mozjpeg. - Source: Hacker News / over 2 years ago

• Random Code Inspiration Volume 2

  Image-shrinker is a simple, easy to use open source tool for shrinking images. Under the hood it uses pngquant, mozjpg, SVGO, and gifsicle. You can also install these tools individually if you need to compress some images. I often use pngquantafter exporting PNGs for web projects from Figma or similar tools. I literally run it like this:. - Source: dev.to / almost 3 years ago

• JPEG XL: How It Started, How It’s Going

  > MozJPEG is a patch for libjpeg-turbo. Please send pull requests to libjpeg-turbo if the changes aren't specific to newly-added MozJPEG-only compression code. https://github.com/mozilla/mozjpeg#mozilla-jpeg-encoder-proj.... - Source: Hacker News / about 3 years ago

• Why there may never be a libjpeg-turbo 3.1

  FWIW, Mozilla has been maintaining their own fork for quite a while now[1] AFAIK most Linux Distros have been using libjpeg-turbo as a drop-in replacement for libjpeg, after some drama in ~2010 where libjpeg came under new management, decided to break ABI/API several times over and add incompatible, non-standard format extensions[2]. [1] https://github.com/mozilla/mozjpeg. - Source: Hacker News / about 3 years ago

• Are all JPEG compression implementations the same?

  No. See https://github.com/mozilla/mozjpeg Also, there is a fairly big problem with JPG that the ‘quality’ setting is not calibrated. That is you might look at one image and think it looks fine (which is subjective, depends on what you want to use the image for…) with a quality of 60%, but then you compress a million images at that rate, delete the originals, then... - Source: Hacker News / over 3 years ago

• reduce the size of a bunch of jpg

  Https://github.com/mozilla/mozjpeg's cjpeg tool is the command line version of the mozjpeg library, itself a fork of libjpeg-turbo. Mozjpeg performs lossless JPEG optimization. There are plenty of others out there. Source: almost 4 years ago

• Lossy Image Compression with Dithering

  Use the Mozilla JPEG Encoder, which implements several tricks for smaller file size / better visual quality. The result is still JPEG standard compatible that other software can decode. Source: about 4 years ago

• Fighting JPEG Color Banding

  Guetzli was already mentioned and roughly does what you are talking about. MozJPEG [1] includes several quantization tables that are optimized for different contexts (see the quant-table flag and source code for specific tables[2]), and the default quantization table has been optimized to outperform the recommended quantization tables in the original JPEG spec (Annex K). It's also worth noting that MozJPEG uses... - Source: Hacker News / about 4 years ago

• FFmpeg now supports JPEG XL

  They're still being used. A newer, optimized JPEG encoder, mozJPEG[0], seems to use progressive encoding by default. I suspect with faster internet speeds, most images download and decode so fast that the cool 'enhance' animation doesn't happen anymore. [0] https://github.com/mozilla/mozjpeg. - Source: Hacker News / over 4 years ago

• AVIF Has Landed

  Mozjpeg greatly improved the state of art jpeg encodig, while maintaining full backwards compatibility https://github.com/mozilla/mozjpeg but there's a limit on what can be done with the primitives that jpeg offers. For example, jpeg is stuck with the older huffman coding for the entropy encoding part, instead of the better arithmetic coding or asymetric numeral systems. - Source: Hacker News / over 4 years ago

• WASM instead of C Dependencies?

  Testsetup: Encode a 6048x2048px big image using mozjpeg (mozjpeg-sys to be more specific), resize it down to 1008x665px using PistonDevelopers/resize, and decode it again using mozjpeg. - Source: dev.to / over 4 years ago

• 30-98% smaller JPG/PNG files with mozjpeg optimization bash scripts (V2 of my script)

  I wrote a bash script (code is here) that uses mozjpeg to recursively optimize JPGs and PNGs to smaller JPGs with minimal loss in image quality. I've found that JPGs optimized by this script are often 30-80% smaller than the original files. PNG optimization in turn often leads to JPGs that are 90-98% smaller. Example: original JPG (1.7 megabytes) and after optimization with my script (0.8 megabytes). Quality loss... Source: about 5 years ago

• Optimize JPG/PNG files near losslessly with mozjpeg based bash scripts

  I wrote two bash scripts (see comments section) that use mozjpeg (https://github.com/mozilla/mozjpeg) to recursively (i.e. Subfolders included) optimize/compress JPG and PNG files to smaller JPG files without significant loss in image quality. The scripts should work on various Debian and Ubuntu distros. I wrote these scripts because default mozjpeg settings don't produce the best possible results and it also... Source: about 5 years ago