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A pattern on the base of APS film cartridges that tells the camera the film speed and number of exposures, so when loading a film you don't have to worry about getting it wrong. Or, in a more general sense, a data disc can be any disc with electronic files on it.
This is how much data (usually indicated in megabytes [MB]) that can be stored on either a hard drive or a drive's removable media disks.
A company that looks after web site data, and offers data connections to the rest of the Internet, usually from its own secure server computer.
Standard method of image data compression used to reduce the file size of digital images. It's known as lossy compression because there is a permanent loss of some data during the process.
APS films are coated with an invisible magnetic coating that doesn't affect picture quality but holds Information Exchange (IX) data which can be read by cameras and processing machinery. Data recorded could include the user's selected print format, date, time and information about the shooting conditions to helps the printing machine achieve optimum print quality. This is known as Print Quality Improvement (PQI).
A lightbox that has a mirror and lens projection system built in so that the user can present data to groups using acetate sheets printed with data.
A device found in digital cameras and scanners that converts analogue picture information (continuous tone subject) to digital data (digital image).
A code for exchanging information between data processing systems and peripherals such as postscript printers.
An area of internal memory that temporarily holds reusable data to ensure a faster access time. Large programmes, such as PhotoShop, require quite a bit of cache, otherwise they get very slow.
A CD that can be used only once to write data on using a CD-Writer.
This looks just like an audio CD and is used to carry up to 740MB of computer data, including images and software.
A CD that can be re-used to write data on using a CD-Rewriter.
A digital process that reduces the number of bits in an image to reduce the file size. The benefit is that it takes less storage space and can be e-mailed quicker. There are two types of compression – Lossy which permanently loses detail and Lossless that returns all the data. JPEG lossy compression is the common method for digital imaging and can be adjusted to offer low compression which maintains most of the quality or higher compression which starts to affect image quality.
Central processing unit. This is a computer's microprocessor that's connected to the motherboard. Its speed is measured in Mhz, which indicates how quickly the computer can handle data. You need a fast one to minimise processing time while working with digital images.
Automatically joining segments of data that have been split when saved on the hard disk. Doing this tidies up the drive and creates more space.
A type of internal memory for personal computers.
The amount of data held in a file determines its size. High resolution digital images can be 50 megabytes, for instance, while a text document may only be a few hundred kilobytes or less. Images can be compressed to save space, and folders of text and pictures can be grouped and reduced in size using programmes such as Stuffit, WinRAR or WinZip.
A type of memory that can hold data without needing power. It's used in SmartMedia and CompactFlash cards so photographs are safely stored when the camera is switched off.
A method of transferring files and data over a network. You use an FTP program to upload web pages created on your computer to a server so they can be accessed on your web site.
A telephone connection used mostly by businesses because it allows data files to be transmitted at about twice the speed of normal telephone lines. It costs about 50 to convert a line and costs about 40 per month rental.
A data file size that comprises 1024 bytes.
A small box that connects the computer to a phone line so the user can access the Internet or send and receive faxes. Internal and external versions are available to convert the digital data to analogue signals ready to be transmitted down the line.
Where the data of a digital image is changed or optimised without removing pixels. This is necessary when using pictures on the Web that need to be as small as possible. Some programs have an auto optimising feature that will convert the picture to a JPEG and include the necessary colour palette to ensure the picture looks as good as it did before optimisation.
A computer peripheral that’s used to output prints from digital images or data files. Most inexpensive printers are inkjet models that squirt out tiny jets of ink onto paper to make up the photograph. More expensive models tend to be either laser printer or dye-sublimation printers.
A portable hard drive such as a Zip drive or Magneto Optical that uses removable cartridges to hold data. Zip disks are either 100 or 250Mb while magneto optical are 230Mb, 640Mb or 1.3Gb. The disks can be reused and are ideal for backing up and transporting large digital images.