Optimizing performance in your iBooks Author books
You can use iBooks Author to create media-rich books compatible with iBooks on iPad. Large books can take a long time to preview, export, or publish. Use these tips to optimize performance in your books.
Working with images
- Use JPG for opaque raster images and PNG for transparent raster images whenever possible.
- Resize, crop, and rotate images to the desired size and rotation before importing them into iBooks Author.
- If you need to use high-resolution images in your book, wait to add them until your book is near completion.
Publishing to the iBooks Store:
If most of your readers will be using the original iPad, scale down images in Interactive Image widgets to a width of 2048 pixels and all other images to a width of 1024 pixels.
Previewing on iPad, or exporting for distribution outside the iBooks Store:
You can improve the viewing experience on iPad models without Retina display by scaling down images in Interactive Image widgets to a width of 2048 pixels and all other images to a width of 1024 pixels.
Working with movies
- Trim your movies to the desired length before exporting them for use in iBooks Author.
- For more information about working with movie files in iBooks Author, see iBooks Author: Add video to your iBook.
Using the 3D widget
See iBooks Author: Best practices for using 3D models for information on optimizing your 3D objects.
- Organize your book into chapters with sections. Avoid creating large sections or chapters.
- Avoid adding too many widgets to a single page.
- iBooks Store only will accept books up to 2.0 GB for publication. While you can distribute larger books for free through other channels, keep the size down for best results and to avoid performance issues.
- As an alternative to using the Preview function in iBooks Author, you also can export your book as an iBooks file. Then, copy that file to your iPad through iTunes.