![]() ![]() You can combine any number of ImageMagick/libvips operations into a variant, as well as any macros provided by the ImageProcessing gem (such as resize_to_limit): avatar. Then it'll upload said variant to the service according to a derivative key of the blob and the transformations. This will create and process a variant of the avatar blob that's constrained to a height and width of 100. Example: avatar.variant(resize_to_limit: ).processed.url ![]() Otherwise it will perform the transformations, upload the variant to the service, and return itself again. ![]() This will check that the variant has already been processed and uploaded to the service, and, if so, just return that. When you do want to actually produce the variant needed, call processed. This will create a URL for that specific blob with that specific variant, which the ActiveStorage::RepresentationsController can then produce on-demand. To refer to such a delayed on-demand variant, simply link to the variant through the resolved route provided by Active Storage like so: Delay the processing to an on-demand controller, like the one provided in ActiveStorage::RepresentationsController. You shouldn't be processing variants inline in a template, for example. Because of this process, you also want to be considerate about when the variant is actually processed. Note that to create a variant it's necessary to download the entire blob file from the service. By default, images will be processed with ImageMagick using the MiniMagick gem, but you can also switch to the libvips processor operated by the ruby-vips gem). Variants rely on ImageProcessing gem for the actual transformations of the file, so you must add gem "image_processing" to your Gemfile if you wish to use variants. minimagick Using MiniMagick the ruby processes memory remains small (it spawns ImageMagick’s command line program mogrify which takes up some memory as well, but is much smaller compared to. These variants are used to create thumbnails, fixed-size avatars, or any other derivative image from the original. Posted on Edited on In Programming Language, Ruby, Awesome Ruby Gem Views: Word count in article: 12k Reading time 11 mins. Image blobs can have variants that are the result of a set of transformations applied to the original. ![]()
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