Apple has updated iBooks, its ebook/PDF reader, to version 1.1.1. You can now zoom in on any image and see it in high resolution.

It also offers performance tweaks for reading PDFs. What’s more, iBooks 1.1.1 lets you look up definitions to English words inside books without a specified language and fixes some bugs.

iBooks works with the The iBookstore features books from major and independent publishers. Once you’ve bought a book — or download a free one — it’s displayed on your Bookshelf. Just tap it to start reading. iBooks 1.1.1 is a free download at the Apple App Store and works with the iPad, iPhone or iPod touch.