#Using gifsicle on windows full#
A page full of gifs can make even a beefy computer or device strain itself, so just because you can bombard your users with animations doesn’t mean that you should (at least, if you care about user experience). The smaller you go, the harder Gifsicle has to work to round everything out in fact, you may find that gifs with smaller dimensions sometimes carry a larger filesize.įinally, I’ll remind you that while gifs can be a lot of fun, they’re not always the best way to convey a message. 500×280 instead of 500×281) tend to resize much cleaner and with less distortion.
In my testing, I’ve found that gifs with even dimensions (e.g. You may also notice that there was some rounding going on, even in my examples. You may have noticed there’s a bit of math involved with resizing images it’s nothing that requires an advanced degree, but it’s still not how I’d like to spend my afternoon. Even if you’re not using WordPress, I’d encourage you to look at the image_resize_dimensions() function and how it’s implemented this is a geometry problem that’s been solved before, so there’s no need to reinvent the wheel. gif > anim.gif Extracting frames from animations is easy too: gifsicle anim.gif 0 > firstframe. Making a GIF animation with gifsicle is easy: gifsicle-delay10 -loop. Now that we have the hard-coded version, we’ll break this up into placeholders ( using proper escaping for shell arguments, of course) and we’ll find ourselves with the full, variable-filled version we had before! Gotchas Gifsicle is a command-line tool for creating, editing, and getting information about GIF images and animations. With these numbers at hand, we can ask Gifsicle to resize our image to 267×150: 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 and thus cannot end up smaller than 150px or we risk our 150×150 frame not being filled. Now, let’s say we want a square version of that same image, at 150×150. In order to achieve this, we need to perform two operations: resizing the image to fit as much of it as possible into a 150×150 box, then crop off anything outside that area.įortunately, resizing the image is easy: Gifsicle has a -resize option, and the math that led us to our getimagesize()-compatible calculations up above would tell us that to fit a 500×281 image in a 150×150 box, our target dimensions would be 267×150. The original dimensions of this image are 500×281, approximately a 16:9 aspect ratio. You can also use this tool to resize animated WebP, APNG, FLIF, and MNG files without losing animation, and any other common image type.Well, that was easy, wasn’t it? In case you’re not well-versed in juggling arguments and using PHP to assemble CLI commands, we’ll apply some real numbers: let’s say we have this gif of America’s Sweetheart, Nick Offerman: You can select the action to perform if the aspect ratio of the source image and your chosen size does not match - center and crop the image, stretch the image to fit, or force the original aspect ratio. Gifsicle is usually the fastest tool and produces smaller files, but is designed for speed, not quality.
Try different resize methods if you are not satisfied with the result. Some gifs may need the "coalesce" option (which removes all optimizations from frames) if other methods fail and the output image is flickering or has strange artifacts, but it may significantly increase file size and is very slow. GIF animation resizing is sometimes tricky, and you will probably have to choose between a smaller file size or image quality. Useful when you need to reduce GIF size or fit the image in specific dimensions.
#Using gifsicle on windows install#
Ezgif's online image resizer will resize, crop, or flip animated gifs and other images, with the same quality and speed as professional software, without the need to buy and install anything.
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