When you’re uploading photos to a website, it’s important to ensure that they are displayed at the right size. Otherwise, when you upload an exceptionally large image, chances are good that it will break your site’s layout. To prevent this, you’ll want to scale these images so that they’re a consistent size, and create thumbnails for use in listing pages. Image styles are a feature that’s part of Drupal core’s Image module, and it provides these options and many more for displaying images. In this lesson we'll get an overview of the core image styles feature so that we understand how it works, which styles and effects we have to work with, and some tips for troubleshooting when your images don't display properly.
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This video covers a topic in Drupal 7 which may or may not be the version you're using. We're keeping this tutorial online as a courtesy to users of Drupal 7, but we consider it archived.