You can apply flattener settings to individual spreads in a document, overriding the flattener preset you’ve set for the entire document or book. This is useful for controlling the flattening quality in documents with a mix of high-resolution images with lots of transparency and low-resolution images. In this case, you can flatten the complex spread at a high quality, and use a faster and lower-quality flattener preset on the other spreads.

At print or export time, you can revert to the flattener settings for the document or book.