A digital camera's connectivity defines how it can be connected to other devices for the transfer, viewing, or printing of images, and to use the camera for remote capture.
Early digital cameras used slow RS232 (serial) connections to transfer images to your computer. Most digital cameras now feature USB 1.1 connectivity, with higher end models offering USB 2.0 and FireWire (IEEE 1394) connectivity. Manufacturers generally bundle such cameras with cables and driver software.
Note that real transfer rates are always lower than the theoretical transfer rates indicated in the table below. Practical transfer speeds depend on your computer hardware and software configuration, the type of camera or reader, the type and quality of the storage card, whether you are reading or writing (reading is faster than writing), the average file size (a few large files transfer faster than many small ones), etc.
Instead of connecting the camera with a cable to your computer you can also insert the storage card into the PC Card slot of your notebook or a dedicated card-reader.
|Theoretical Transfer Speeds||Transfer Rate|
|USB 2.0 - Low-Speed = USB 1.1 Minimum||1.5 Mbps|
|USB 2.0 - Full-Speed = USB 1.1 Maximum||12 Mbps|
|USB 2.0 - High-Speed||480 Mbps|
|Practical Transfer Speeds||Approx. Transfer Rate|
|Digital Camera USB 1.1||~ 350 KB/s|
|Digital Camera FireWire||~ 500 KB/s|
|USB 1.1 Card Reader||~ 900 KB/s||~ 7 Mbps|
|PC/PCMCIA Card Slot on notebook||~ 1,300 KB/s||~ 10 Mbps|
|USB 2.0 or FireWire Card Reader||~ 3,200 KB/s||~ 25 Mbps|
A transfer rate of 1 Megabit per second (Mbps) equals 128 Kilobytes per second(KB/s) and is able to transfer 7.5 Megabytesof information per minuteor about four 5 megapixel JPEG images.
Most digital cameras also provide video (and sometimes audio) output for connection to a TV or VCR. More flexible cameras allow you to switch output between the PAL and NTSC video standards. Cameras with infrared remote controls make it easy to do slideshows for friends and family from the comfort of your armchair.
Some digital cameras, e.g. those with PictBridge and USB Direct Print support, allow you to print images directly from the camera to an enabled printer via a USB cable without the need for a computer. Although printing directly from a digital camera is convenient, it eliminates one of the key benefits of digital imaging —the ability to edit and optimize your images.
This article is written by Vincent Bockaert,
author of The 123 of digital imaging Interactive Learning Suite
Click here to visit 123di.com