Here are the commands for all of the dependencies we need to start optimizing images: sudo apt-get update Again, we’re writing Bash scripts, so we’ll be spending time in the command line. Set upīefore we start, let’s get all of our dependencies in order. This GitHub repo has all the images we’re using and you’re welcome to grab them and follow along. The idea is to optimize images before we serve them so that users get the most visually awesome experience without all the byte bloat. In this tutorial, we will write bash scripts that create and optimize images in different image formats, targeting the most common formats, including JPG, PNG, WebP, and SVG. There are tons of ways we can make smaller and optimized images. And while they aren’t really in the same class as raster images, SVGs are another format many of us have been using in recent years because of their inherently light weight. Although these new formats are still in development and generally have limited browser support, one of them, WebP, is gaining a lot of attention. Researchers around the world are busy developing new image formats that possess high visual quality despite being smaller in size compared to other formats like PNG or JPG. And if they’re downloading extra bytes, the site not only takes that much more time to load, but users are using more data, both of which can be resolved, at least in part, by optimizing the images before they are downloaded. And if images are not optimized, users end up downloading extra bytes. Specifics depend on how you've configured things, but the source will show something like /sites/default/files/styles/yourstylename/public/something/myimage.jpg if the image was generated from a style setting.Images take up to 50% of the total size of an average web page. The path in the source code for the image will tell you if an image style is applied to it. You can also just do an "inspect element" (that's Chrome's language for it) on the image as it is displaying on your site. If it is anything other than None (original image), then that's where the scaling is coming from. At admin/structure/types/manage/ content_type_machine_name/display (that's the Manage Display tab of, check the Node image style for the field in question. To see what image styles may be getting applied to your image, there are a couple of ways to check. To eliminate the chance that this is anything that your browser is contributing, if you right-click the image and "Open image in new tab,", you'll see the true image in that tab, without any chance of html scaling. In D7, I usually have admin/config/media/image-toolkit set to 75%. That being said, it still re-compressed the image newly Hayward, on my sites I have never seen the kind of major artifacts in any Drupal-scaled jpegs that you describe. In the more general case, image scaling is configured here: admin/config/media/image-styles/edit/comic In my case, the image has a configuration under Comicdrop: This post was of type "Comic", using module Comicdrop. The dimensions saved by Drupal were the same, but the artifacts look like moon craters. I then shrank the image dimensions to 720x1131, and uploaded again. The image size would have exceeded the CSS rule for the main content area: I'm not sure where the constraint is set. It had a subtle gradient and headline type, which took on exaggerated artifacts. Because JPEG is lossy, the image then looked awful. This is not re-sizing in the HTML attributes the actual size was changed. Perhaps because of width constraints in my theme, the image was 720 x 1131 pixels, after upload. ![]() Is there really no way to disable image tampering? I think that users really should be able to decide for themselves if they want Drupal interfering or not. The best I have found so far is to set it top about 95%, where I see only a small change in filesize and quality. ![]() With it set to 100%, I can't see any change in the quality of the images, but the filesize increases massively - 3 or 4 times in some cases. with it set to 0, I get the most blocky looking images on the planet. I have tried setting the 'jpeg quality' to 0 or 100%, neither of which disable the compression. ![]() However, when I upload one of these images via a cck imagefield, they get compressed again, and either the quality or filesize is completely messed up. I have spent time and effort compressing my images exactly the way I want them, to optimise the quality and filesize to my needs. How can I disable automatic compression of images? I don't want Drupal screwing with my uploaded images. So, question 1) What does each setting do - why are there 2 settings? As far as I can make out, the imageapi setting affects imagefield and imagecache, whilst the other setting effects other uploaded images.Ģ) More importantly. There seem to be two places where I can set the 'JPEG quality' of uploaded images:
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