Assets and Thumbnailing

You can set site-wide or page settings to make Blueprint create versions of uploaded images in one or more sizes. This can help to ensure that the images your clients upload are always of an appropriate size for the context they're being displayed in.

For example, when using the Gallery blueprint you may wish to have each image saved at a uniform width for use in a slideshow, along with thumbnails for navigation. To do this, you'd specify two page settings for that gallery, where the key is "Asset Type: name of version" and the Value is a geometry string:

Key: Asset Type: gallery  
Value: 800x>

Key: Asset Type: gallery_thumbnail
Value: 100x>

You can refer to these specific versions of images in your templates. For example:

<%= image_tag(image.public_filename(:gallery)) %>

These versions are also accessible from within the asset placement dialog.