Brew install gifsicle3/10/2023 Instead of the filename extension, default is false. Pass an optional `identify` parameter to identify file types using ImageMagick or GraphicsMagick `identify` ImageOptimizer.new('path/to/file.gif', level: 3).optimize Other allowed flag are `-O2` (Also uses transparency to shrink the file further), `-O3` (Try several optimization methods, usually slower, sometimes better results) It stores only the changed portion of each image. ImageOptimizer.new('path/to/file.png', strip_metadata: false).optimizeīy default, `gifsicle` is called with the `-O1` flag, which controls the level of the JPEG optimizer will ignore the value. You can skip removing the meta data by changing the `strip_metadata` parameter to This default generates the most optimized results. By default -or8.png or -fs8.png is used.īy default, `optipng` is called with the `-strip all` flag, which removes all the png' set custom extension (suffix) for output filename. Flag '-skip-if-larger' skips images which are smaller. This runs pngquant on all png files in the current directory and subdirectory and optimized them in place. Pngquant is called with the '-skip-if-larger', '-speed 1','-force', '-verbose', '-ext. ImageOptimizer.new('path/to/file.png', level: 3).optimize You can pass an optional `level` parameter to change this value. This default level generates the most optimized results, at theĮxpense of very high execution times, so you may want to lower it if your server ImageOptimizer.new('path/to/file.jpg', quality: 80).optimizeīy default, `optipng` is called with the `-o7` flag, which controls the level of Pass an optional `quality` parameter to target a specific lossy JPG quality level (0-100), default is lossless ImageOptimizer.new('path/to/file.jpg', quiet: true).optimize To have optimization performed in quiet mode without logging progress, an optional `quiet` parameter may be passed. ImageOptimizer.new('path/to/file.gif').optimize Gifsicle’s optimizer is pretty powerful, and usually reduces animations to within a couple bytes of the best commercial optimizers. You can also use transparency to make them even smaller. This stores only the changed portion of each frame, and can radically shrink your GIFs. Gifsicle is a command-line tool for creating, editing, and getting information about GIF images and animations. ImageOptimizer.new('path/to/file.jpg').optimize Jpegoptim provides lossless optimization for JPEG files based on optimizing the Huffman tables.Īll jpegs will be progressively optimized for a better web experience ImageOptimizer::PNGQuantOptimizer.new('path/to/file.png').optimize Generated images are compatible with all modern web browsers, and have better fallback in IE6 than 24-bit PNGs. The conversion reduces file sizes significantly (often as much as 70%) and preserves full alpha transparency. Pngquant is a command-line utility and a library for lossy compression of PNG images. ImageOptimizer.new('path/to/file.png').optimize Performs PNG integrity checks and corrections. OptiPNG is a PNG optimizer that recompresses image files to a smaller size without losing any information and Then add this line to your application's Gemfile: $ brew install optipng jpegoptim gifsicle pngquant OptiPNG, which can be installed from ()ģ. jpegoptim, which can be installed from ()Ģ. # This gem uses the following utilities for optimizing images:ġ. The images are visually different but the size savings are huge, which is particularly important if you plan to put 50+ images on a single web page.This gem allows you to simply optimize images via jpegoptim or OptiPNG. The results were that a 383KB file dropped down to just 70KB. Then I ran this to apply oxipng: oxipng -o 3 -i 0 -strip safe *-fs8.png This creates a file called x-fs8.png for any file called x.png. (I don't know if the lower bound of 20 is the right thing to do here, maybe 0-50 would be better?) Then I ran this command to reduce to a maximum of 50 colours per image: pngquant -quality 20-50 *.png I got great results by running pngquant first, then oxipng on the results.īoth can be installed via Homebrew: brew install pngquant oxipng Oxipng is a performante lossless PNG compressor. Pngquant can reduce the number of colours in a PNG image, which I find makes a huge differente to the file size (also possible using Squoosh). I usually use Squoosh.app to reduce the size of my PNGs, but in this case I had a folder with nearly 50 images in it so I wanted to do it using the command-line. Simon Willison’s TILs Shrinking PNG files with pngquant and oxipng Shrinking PNG files with pngquant and oxipng | Simon Willison’s TILs
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