发信人: weekend(笨刚)
整理人: glonely(2004-03-21 21:34:22), 站内信件
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PowerShot G3，Coolpix 5700等较新的数码相机都支持ptp协议，该协议在usb口上实现，windows xp和mac已经内含对ptp协议的支持，无需另找驱动程序。PTP是最早由柯达公司与微软公司制定的一种标准。可以在相机上选择要打印或者要传输到电脑(打印机)，其他存储设备的照片。
By 2001, Sony appears to be the second vendor after Kodak to implement PTP on its digital cameras, offering it in conjunction with USB Mass Storage. By the end of 2002, Nikon seems to have made the switch too by offering several firmware upgrades to offer PTP support in addition to USB Mass Storage. Canon did the same, and that is a great news as Canon was one of the last major vendor to not use USB Mass Storage, and the company had an heavy past of being really unfriendly with gphoto2 developers and the whole "non Windows" developer community
DPS(直接打印标准)和ptp协议结合，可以直接将打印机和数码相机连接打印相片而不再需要电脑，是由佳能、富士、惠普、奥林巴斯、精工爱普生及索尼这六家相机和打印机制造商提出的，DPS使用USB1.0作为物理层，而数码相机和PC则通过USB接口采用图片传输协议(PTP)进行图片文件传输。该协议由国际图片产业协会(IIIA)在2000年7月制定。
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