Barnes & Noble introduces two HD tablets

Barnes & Noble will add high-definition tablet computers to its Nook roster.

The 7-inch Nook HD and 9-inch Nook HD+ will be available in early November and can be preordered starting today at barnesandnoble.com.

The Nook HD has a touch screen that has a graphics-display resolution of 1440 x 900 pixels. It also has 720p HD video resolution and uses a 1.3-gigahertz (GHz) dual-core processor. The Nook HD’s screen has the highest resolution of any 7-inch tablet screen. An 8GB model starts at $199, and a 16GB model starts at $229.

The Nook HD+ has a 1920 x 1280 resolution touch screen, 1080p HD video resolution and a 1.5-GHz dual-core processor. A 16GB model starts at $269; a 32GB model starts at $299.

Both tablets also will include access to Barnes & Noble’s new Nook Video, which is a video library from which Nook HD and Nook HD+ users can download or stream movies and TV shows. A Nook Video mobile application allows video content from the video library to be stored on the Nook cloud computing system and accessed on a notebook computer, a smartphone or a TV that has High-Definition Multimedia Interface capability.