An image with one bit of color information per pixel, also known as a bitmapped image. The only colors displayed in a bitmapped image are black and white.

One of three dimensions of color; the other two are hue and saturation. The term is used to describe differences in the intensity of light reflected from or transmitted through an image independent of its hue and saturation.

To store on a computer user's hard disk a local copy of a web page accessed via the internet. The web browser compares the cached copy of the page to the original, and if there have been no changes, the browser and server programs will use the cached copy rather than reloading the page onto the client, saving processing and download time. Also refers to a website's database generating static copies of frequently requested dynamic pages, reducing processing time.

Computer hardware or software used by an end user on a computer network or the internet to query a remote server. A web browser is an example of client software. Also called a local computer.

A four-channel image containing a cyan, magenta, yellow and black channel. A CMYK image is generally used to print a color separation.

The changing of the colors of pixels in an image, including adjusting brightness, contrast, mid-level grays, hue and saturation, to achieve optimum printed results.

A 150K, 72dpi image for evaluation or creating preliminary layouts.

A unique string of letters and numbers that the web server stores in a file on your hard drive. This method is used by web designers to track visitors to a website so the visitors don't have to enter the same information every time they go to a new page or revisit a site. For example, web designers use cookies to keep track of purchases a visitor wants to make while shopping through a web catalog. Cookies may work through a single visit to a website, such as when tracking a shopping trip, or may be set to work through multiple sessions when a visitor returns to the site.

Transfer a file from a remote computer to your computer.

Dots per inch, a measure of image resolution.

A method of encoding messages to provide privacy for email, discussion group postings and other communications as they move over intranets or the internet.

Computer hardware and/or software that limits access to a computer over a network or from an outside source. Used to prevent computer hackers from getting into a company's computer systems.

Hypertext Transfer Protocol. The set of standards that allows computer users to access the internet or the World Wide Web. HTTP:// is the command that tells the browser that the document found at this address is HTTP-compatible, and to display it in HTTP format.

Image size
The size the image will appear in relation to your layout page. This is not necessarily the size of your final piece. For example, if you are creating a full page newspaper ad and this image takes up 1³4 of that ad, then you would choose 1³4 page. If you are running a 1³2 page ad but your image takes up the whole ad, then you would choose full page.

This is the number of editions of a newspaper or magazine your piece will appear in. For example, if you are going to run an ad in the Sunday paper every week for a month, your license period would be one month and your number of inserts would be 4, so you'd choose 4-7.

A computer language developed by Netscape that is a subset of the Java programming language but is easier for nonprogrammers to write. JavaScript programs are run in the web browser on the client side rather than on the server.

Joint Photographic Experts Group. This group established a standard method for compressing and decompressing digitized photos or images. The high-resolution images provided with Glasshouse Images are compressed according to JPEG standards.

"Licensed" with respect to stock photography means you are choosing an image for a particular use. Price depends on a number of factors including print run and image size among others.

A single dot on a computer display or in a digital image.

Where an image will appear in a periodical, brochure, or pamphlet.

If you are producing a printed piece, this should be the total number of copies that will be printed. If the image will appear in a newspaper or magazine, this should be the circulation of one edition of the periodical.

Whether the periodical this image will appear in is distributed to a trade group or to general consumers. This field is necessary for us to provide rights control on some of our licensed images.

The process of changing the resolution of an image that discards pixel information in an image.

Red, green and blue, the additive primaries. RGB is the basic additive color model used for color video display, as on a computer monitor.

Secure Sockets Layer. Used by most commerce servers on the World Wide Web, this high-level security protocol protects the confidentiality and security of data while it is being transmitted through the internet. Based on RSA Data Security's public-key cryptography, SSL is an open protocol that has been submitted to several industry groups as the industry security standard. Denoted by the letters HTTPS in the URL.

Computer hardware and software that is attached to a network and which automatically stores, processes and transmits data or information that is generally accessed by many people using client programs. A standard language is used to define this client-server interaction.

Tagged Image File Format. TIFF is a file format for exchanging bitmapped and grayscale images among applications.

Universal Resource Locator. Pronounced as either "U-R-L" or "Earl." The standardized addressing or naming system used for locating websites over the internet. Also known as an internet address or web address.

To send a copy of a file from one computer to another using a modem.

A Logo or mark that is superimposed on an image. Disappears when you add your mailing and billing profiles on Glasshouse Images.