With iOS 11, Apple adopted the High Efficiency Image Format (HEIF) as a replacement for JPEG on both iOS and macOS. The HEIF format saves a considerable amount of storage space with its .HEIC files (High Efficiency Image Container) being up to 50 percent smaller than the same image saved in JPEG format. Despite the smaller size, the HEIF format can capture 16 bit color whereas the JPEG only handles 8 bit. Clearly HEIF is preferable to JPEG right?
When it comes to privacy, the iPhone, iPad and iPod touch always ask permission for apps to access the Camera Roll. There are several levels of permission granted to apps, spanning from full read and write access to never see photos. If you're interested in checking to see which apps have access to your photos, this information can be seen in one place.
Albums help to keep a large collection of pictures organized in the iOS Photos app. iPhone, iPad and iPod touch users can easily create albums and add photos to an existing album right on their devices. Sometimes albums get too large, or photos need to be reorganized into smaller groups for efficiency.