{{internet hosting, right An image hosting service allows individuals to upload

image An image is a visual representation of something. It can be two-dimensional, three-dimensional, or somehow otherwise feed into the visual system to convey information. An image can be an artifact, such as a photograph or other two-dimensio ...

s to an

Internet The Internet (or internet) is the global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) to communicate between networks and devices. It is a '' network of networks'' that consists of private, p ...

website. The image host will then store the image onto its server, and show the individual different types of code to allow others to view that image. Some of the best known examples are

Flickr Flickr ( ; ) is an American image hosting and video hosting service, as well as an online community, founded in Canada and headquartered in the United States. It was created by Ludicorp in 2004 and was a popular way for amateur and profession ...

Imgur Imgur ( , stylized as imgur) is an American online image sharing and image hosting service with a focus on social gossip that was founded by Alan Schaaf in 2009. The service has hosted viral images and meme, particularly those posted on Reddit ...

and Photobucket, each catering for different purposes.

How it works

Typically image hosting websites provide an upload interface; a form in which the uploader specifies the location of an image file on their local computer file system. After pressing a "Submit" button, the file is uploaded to the image host's

server Server may refer to: Computing *Server (computing), a computer program or a device that provides functionality for other programs or devices, called clients Role * Waiting staff, those who work at a restaurant or a bar attending customers and su ...

. Some image hosts allow the uploader to specify multiple files at once using this form, or the ability to upload one ZIP archive containing multiple images. Additionally, some hosts allow FTP access, where single or multiple files can be uploaded in one session using FTP software or an FTP-capable browser. After this process, the image is hosted on the server. Typically, this means that the image is available on the web (to the public). The uploader may also be allowed to specify inline links to the hosted image, in order to embed it on other websites e.g. * Linking with

HTML The HyperText Markup Language or HTML is the standard markup language for documents designed to be displayed in a web browser. It can be assisted by technologies such as Cascading Style Sheets (CSS) and scripting languages such as JavaS ...

code * Linking with BBcode * A clickable

thumbnail Thumbnails are reduced-size versions of pictures or videos, used to help in recognizing and organizing them, serving the same role for images as a normal text index does for words. In the age of digital images, visual search engines and imag ...

that is linked to the full image Usually, the image host will put restrictions on the maximum image size allowed, or the maximum space or bandwidth allowed per user. Due to bandwidth costs, free services usually offer relatively modest size limits per image when compared to paid services, but allow users hotlinking their images.

Tools

Image hosts also allow tools such as the ability to create photoblogs/galleries with your images, or add them to a slide show for easier viewing. Some offer more advanced tools such as the ability for anl to ato an image they uploaded,

sideload Sideloading describes the process of transferring files between two local devices, in particular between a personal computer and a mobile device such as a mobile phone, smartphone, PDA, tablet, portable media player or e-reader. Sideloading ...

ers, or browser sidebars. Other hosts have introduced novel features such as the ability to automatically resize images down to a user-selected size. A Flickr tool allows one to upload photos using a camera phone with email capability.Story, Derrick
"Great Flickr ad-ons"
Macworld.com, October 9, 2007. Retrieved 15 December 2009.

Identification

Hosting services have the potential ability to identify when and where their images are being used. When an image file is accessed, the image host is capable of logging the date and the general numeric

internet address An Internet Protocol address (IP address) is a numerical label such as that is connected to a computer network that uses the Internet Protocol for communication.. Updated by . An IP address serves two main functions: network interface identi ...

of the request. In the case of

spam Spam may refer to: * Spam (food), a canned pork meat product * Spamming, unsolicited or undesired electronic messages ** Email spam, unsolicited, undesired, or illegal email messages ** Messaging spam, spam targeting users of instant messaging ...

, the messages often include unique image URLs that are specific to that message only. The unique URL is used as a tracking ID, so that the image host can identify exactly what message intended for what specific recipient has been viewed, in addition to the date and host accessing the image. This is why many email reading systems do not show images by default, to protect the reader from having their reading of spam being tracked by the email senders.

Cost

Many image hosts are free, some do not even require registration. Of the free image hosts, the vast majority are supported by

advertisements Advertising is the practice and techniques employed to bring attention to a product or service. Advertising aims to put a product or service in the spotlight in hopes of drawing it attention from consumers. It is typically used to promote a ...

, mostly on their top pages, thumbnail pages, or "not found" pages. Showing advertisements to users has enabled image size and bandwidth limits to increase. Some free hosts have optional paid image hosting functions, while other hosts offer only paid services. Features and storage available are generally better for paid services, while cost is still much less than the cost of purchasing

webhosting A web hosting service is a type of Internet hosting service that hosts websites for clients, i.e. it offers the facilities required for them to create and maintain a site and makes it accessible on the World Wide Web. Companies providing web ...

to operate a

website A website (also written as a web site) is a collection of web pages and related content that is identified by a common domain name and published on at least one web server. Examples of notable websites are Google, Facebook, Amazon, and W ...

. Paid services often allow users to have password protected photo albums, customizable skins, and customized

subdomain In the Domain Name System (DNS) hierarchy, a subdomain is a domain that is a part of another (main) domain. For example, if a domain offered an online store as part of their website example.com, it might use the subdomain shop.example.com . ...

s. There are many other paid services available that offer different packages of options, features, and costs.

History

Before the development of image hosting services, the display and exchange of images on the early public Internet of the 1980s–1990s was a laborious and complex process. Expertise was needed to set up a private file server, to connect it to the Internet, and paying for the potentially expensive dedicated Internet connection. Some experts would provide access to a Unix shell and some file storage, via paid access, free public access, or just made available to a select group of private friends. Uploading of images was accomplished with command-line tools like FTP, or uploading images using slow 14.4 to 33.6 kilobit dialup modem connections and terminal protocols like XMODEM to the server storage. Before the

Web Web most often refers to: * Spider web, a silken structure created by the animal * World Wide Web or the Web, an Internet-based hypertext system Web, WEB, or the Web may also refer to: Computing * WEB, a literate programming system created by ...

was developed, images would primarily be downloaded manually from file servers or from binary newsgroups on

Usenet Usenet () is a worldwide distributed discussion system available on computers. It was developed from the general-purpose Unix-to-Unix Copy (UUCP) dial-up network architecture. Tom Truscott and Jim Ellis conceived the idea in 1979, and it wa ...

, and displayed with a separate image viewer. The expansion of the Web in the 1990s brought text and images together, allowing for inline display of images without separate downloading, but still required the above expertise and methods to make the images available. Also, on the early web, some technical knowledge was required to know how to even make an uploaded image display on a discussion forum. Typically, images would accessed using a URL format similar to:

http://www.website.com/~username/directory/image.jpg

but to make the image actually display in a discussion forum, this would need to be manually rewritten in HTML markup in the forum post, as

One of the primary new features of the early and developing Web that enabled the easy sharing of images and other data, was the concept of being able to upload or HTTP POST a file via the web browser to the remote server. This alone helped to eliminate all the complex steps of needing to understand

command line A command-line interpreter or command-line processor uses a command-line interface (CLI) to receive commands from a user in the form of lines of text. This provides a means of setting parameters for the environment, invoking executables and pro ...

tools like FTP or uploading via a modem terminal. Early image and data storage servers also initially left the uploaded content unchanged, sometimes resulting in undesirable web page display problems, such as too high resolution causing page layout problems in discussion forums, or too high detail causing very slow page loading times. The sharing of potentially incompatible image formats could also result in them not displaying properly for some viewers. The early and developing image sharing services eventually added the ability to automatically resize and recompress uploaded images into standardized sizes and formats, for maximum browser compatibility and minimizing of bandwidth usage for unnecessarily large images. The provision for early image sharing services to automatically create sharing links also reduced the need for technical knowledge of where the image was uploaded.

References