Picture Transfer Protocol (PTP) is a protocol developed by the International Imaging Industry Association to allow the transfer of images from digital cameras to computers and other peripheral devices without the need of additional device drivers. The protocol has been standardised as ISO 15740.
PTP specifies a way of creating, transferring and manipulating objects which are typically photographic images such as a JPEG file. While it is common to think of the objects that PTP handle as files, they are abstract entities identified solely by a 32-bit object ID. These objects can however have parents and siblings so that a file-system–like view of device contents can be created.
