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This article was updated in January 2021 by the editor. If the height is fixed and the width proportionally variable, it's pretty much the same thing, you just need to switch things around a bit: blog and republished under Creative Commons with permission. You can use the same filename to overwrite the full-size image with the resized image, if that is what you want. Also, notice I saved the resized image under a different name, resized_image.jpg, because I wanted to preserve the full-size image ( fullsized_image.jpg) as well. You can change basewidth to any other number if you need a different width for your images. The resulting height value is saved in the variable hsize. The proportional height is calculated by determining what percentage 300 pixels is of the original width ( img.size) and then multiplying the original height ( img.size) by that percentage.
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These few lines of Python code resize an image ( fullsized_image.jpg) using Pillow to a width of 300 pixels, which is set in the variable basewidth and a height proportional to the new width. Img = img.resize((basewidth, hsize), Image.ANTIALIAS) Just import your PNG image in the editor on the left and you will instantly get a transparent PNG on the right. Hsize = int((float(img.size) * float(wpercent))) Worlds simplest online Portable Network Graphics transparency maker. Here's a basic script to resize an image using the Pillow module: from PIL import Image To install Pillow, use the pip module of Python: $ python3 -m pip install Pillow Scaling by width So I looked around and found Pillow, a Python imaging library and "friendly fork" of an old library just called PIL. Some time ago, I wrote a Python script where I needed to resize a bunch of images while at the same time keeping the aspect ratio (the proportions) intact. Doing so is as simple as providing an input file and specifying an output filename and extension.I love Python, and I've been learning it for a while now. One of the simplest things you can do with ImageMagick is change the file type of an image. The main work-horse of ImagicMagicK is the convert command which can be used for various image manipulation task such as resizing, bluring, cropping and more. It supports over 200 file formats and is available for download on Linux, Windows, Mac OSX, Android, iOS and more. ImageMagick, created in 1987 by John Cristy, is unlike Photoshop in that it does not come will a graphical user interface (though under Unix-like operating systems it's display command can display images in a window). Luckily there is an alternative in ImageMagick, an open source suite of utilities for manipulating images via the command-line. Depending on how wrong the images are it can be quicker to simply make the edits yourself however in my experience developers often don't have access to image editing software like Photoshop. Asking the designer to resupply the images can often lead to a lot of back-and-forth between dev and design which is an arduous process that can slow productivity on both ends. Worse still a designer may have supplied multiple images which are close but not-quite to the specifications you require. Perhaps a designer has provided an image 1 pixel too wide or in the wrong format. There has been many times during my career as a developer where I've received images from a designer which are not-quite-right in some way. Home Command-line image editing with ImageMagick