What is PictBridge and PTP?

In December of 2002, the Camera & Imaging Products Association (CIPA) started an initiative which had the goal of a global standard to enable direct printing from digital cameras on appropriately equipped photo printers, independent of the model or manufacturer of the camera or the printer. The standard was christened the Direct Print Standard (DPS) and the commercial products that resulted from the initiative are referred to as being PictBridge compliant. In PictBridge, USB is used as a physical layer, and Picture Transfer Protocol (PTP) is used as the transport layer protocol. The newly defined DPS layer is located between PTP and the DPS application layer. The DPS layer translates DPS operations and events into PTP operations and events, and vice versa. PictBridge defines the interface between the DPS layer and the DPS application layer. PictBridge does not make any changes or additions to the standard transport layer and below. PictBridge defines several software components, which include a print Server/Client and a storage Server/Client at the DPS application layer, and DPS discovery at the DPS layer. In PictBridge the storage client is indirectly initiated by user operations and therefore is not visible to the user. The storage client requests image data to the storage server when the printer executes a print job upon the request of the digital camera. The operations and events of the DPS applications are executed based on a Server/Client model. A DPS operation consists of a request from a client to a server and followed by a response from the server to the client. A DPS event consists of a request from a server to...

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