You may have noticed thereвЂ™s a bit of math involved with resizing images itвЂ™s nothing that requires an advanced degree, but itвЂ™s still not how IвЂ™d like to spend my afternoon.В Even if youвЂ™re not using WordPress, IвЂ™d encourage you to look at the image_resize_dimensions()В function and how itвЂ™s implemented this is a geometry problem thatвЂ™s been solved before, so thereвЂ™s no need to reinvent the wheel. Now that we have the hard-coded version, weвЂ™ll break this up into placeholders ( using proper escaping for shell arguments, of course) andВ weвЂ™ll find ourselves with the full, variable-filled version we had before! Gotchas With these numbers at hand, we can ask Gifsicle to resize our image to 267Г—150: Given the height, we can calculate the width thusly: $src_width / $src_height * $dst_height, or 500 / 281 * 150, which gives us a width of 267px. Confused? Just remember that we have a 16:9 aspect ratio, meaning the height is the smaller dimension andВ thus cannot end up smaller than 150px or we risk our 150Г—150 frame not being filled. Now, letвЂ™s say we want a square version of that same image, at 150Г—150.В In order to achieve this, we need to perform two operations: resizing the image toВ fit as much of it as possible into a 150Г—150 box, then crop off anything outside that area.ДЇortunately, resizing the image is easy: Gifsicle has a -resizeВ option, and the math that led us to our getimagesize()-compatible calculations up above would tell us that to fit a 500Г—281 image in a 150Г—150 box, our target dimensions would be 267Г—150. The original dimensions of this image are 500Г—281, approximately a 16:9 aspect ratio. Moreover, chances of errors are reduced through this process, and Gifsicle is a powerful example of the diversity of editing options which can be performed even on graphic elements.Well, that was easy, wasnвЂ™t it? In case youвЂ™re not well-versed in juggling arguments and using PHP to assemble CLI commands, weвЂ™ll apply some real numbers: letвЂ™s say we have this gif of AmericaвЂ™s Sweetheart, Nick Offerman: In conclusionД«ottom line is that not everyone is thrilled to work with shiny designs and interfaces, and is one of the reasons command line utilities are still alive. The result is always in the source folder. Chances are you work with high-quality animations that bundle a lot of colors, but Gifsicle points out what needs to be done.

This doesnвЂ™t need to be performed on more files, but thereвЂ™s also a batch command that lets you manipulate more GIFs at once. There are also some general parameters with which to crop, flip, resize, or rotate a GIF animation. One simple aspect is the possibility to set delay between frames, and this comes in handy if the GIF plays way too fast. ItвЂ™s best to overview documentation so you know what parameters need to be applied, and how. Gifsicle is the component you use to manipulate these animations.

In case they donвЂ™t a list is printed out to display redundant frames, their number, background colors, and version info, with corresponding parameters to use for proper determination. The second is used to compare two different GIF files, showing whether or not the two animations contain identical frames. You notice there are two terminal files you can take advantage of, namely Gifsicle, and Gifdiff. WhatвЂ™s more, GIF files you want to process need to be in the same folder, otherwise things get too complicated for no reason.

ItвЂ™s best to use the Command Prompt with administrator privileges, so that Gifsicle can benefit from all computer resources. Sure enough, just like any command line utility, thereвЂ™s no setup involved. However, this practice is far from being outdated and obsolete, with Gifsicle being proof, letting you enhance, merge, and manipulate GIF animations. Before all the cool interface designs that make work so much easier and easy to grasp by everyone, complex operations had to be performed in the Command Prompt.

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