![]() You can also append ^ to the dimensions to tell ImageMagick that you’d like to resize the image to fill the dimensions, potentially overlapping on one side. What it will do is resize the image to fit within those dimensions. This won’t actually resize the image to the exact dimensions specified. convert original.png -resize 100x100 new.png.To resize an image to specific dimensions, use the convert command with an input file, the -resize parameter, your preferred dimensions, and an output filename: Resize to specific dimensions and keep aspect ratio curl =compress,format -output image.jpg.If you don’t already have a sample image handy to work with, you can download the header image from this tutorial using curl, and save it as image.jpg: On Ubuntu 22.04, you can install it with apt. However, it is widely available in package managers for all platforms. ![]() The ImageMagick library is very popular, but doesn’t usually come installed by default. You can learn how to configure a regular user account by following our Initial server setup guide for Ubuntu 22.04. Prerequisitesīefore you begin this guide, you should have a regular, non-root user with sudo privileges configured on your server. It has libraries for integration into almost all popular programming languages, and you can use it directly with its included commands, mogrify and convert. Essentially, ImageMagick is the most commonly-used program for resizing, converting, or otherwise manipulating images on the command line. Then we wouldn't ask ourselves about creating synthetic tests, we'd just switch some wikis to the new software and measure the impact.If you’ve ever done programmatic image manipulation, you have probably encountered the ImageMagick library or its major fork, GraphicsMagick. Testing new scaler software for a particular format in our code should be easier. Unfortunately, as you know, we're far from that. If our code was better organized, testing GraphicsMagick would only amount to switching from a "convert" command to "gm convert" with exactly the same parameters. Most of the work required here is code cleanup and reorganization. It's the only way to be really sure, in fact, because regardless of how cleverly you pick your test images, or how large the sample is, it will always be an approximation of reality, and the real deal is what matters. The worst that can happen is that GM doesn't perform better and we've made our code more flexible and future-proof.Īs you said, we can "do it live" to figure out if it performs better. I'd argue that the messy way the code is organized is actually an argument for cleaning things up regardless and having a saner per-format logic, and that time is better invested doing so than setting up a larger scale test. I vote for switching to graphicsmagick anyway. If it was to be added as an option, would you prefer a new set of config options or to modify how the current ones are used? also would you prefer it was handled in a separate "if" block or merged with the current imagemagick support? I made a quick patch for my system, however I would think it might be better to actually replace imagemagick with graphicsmagick (for the reasons listed above). It is quite easy to add support for this. GraphicsMagick integrates the -strip with the profile option that already is there to manage image profiles ![]() The -thumbnail on imagemagick is a shortcut to "-resize 120x120 -strip". Gm convert -size 120x120 cockatoo.jpg -resize 120x120 +profile "*" thumbnail.jpg To thumbnail on graphicsmagick you would do It comes with a compatibility package to provide the imagemagick convert/mogrify etc commands but has dropped some of the imagemagick shortcuts like "-thumbnail" ![]() It also seems to have improved documentation (or at least it has examples and descriptions in the man file that imagemagick does not) Graphicsmagick ( ) is a fork of imagemagick, that is smaller, faster and has more api stability.
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