iChat
From Wikipedia, the free encyclopedia
| iChat AV | |
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The official iChat icon |
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| Maintainer: | Apple Inc. |
| Stable release: | 4.0 (601) (October 26, 2007) [+/-] |
| OS: | Mac OS X |
| Use: | Instant messaging client |
| License: | Proprietary |
| Website: | Apple: iChat |
iChat is an AOL Instant Messenger (AIM), and .Mac, client by Apple Inc. for their Mac OS X operating system. Using a Jabber-like protocol and Bonjour for user discovery, it also allows for LAN communication. iChat's AIM support is fully endorsed by AOL, and uses their official implementation of the AIM OSCAR protocol. Using a Jabber transport, iChat users may also integrate their MSN and Yahoo! contacts into the Jabber pane.
It bears a brushed metal interface (as of Mac OS 10.4) and uses speech bubbles and pictures that are meant to personify the online chatting experience. With iChat, green (available), yellow (idle), and red (away) dots can be seen next to the name of each connected user on the buddy list. To cater for color-blind users, this can be altered to show different shapes to illustrate status rather than color.
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[edit] History
In June 2003, Apple Inc. announced iChat AV Public Beta, a new version of iChat that added voice and video chat capabilities. It also introduced the iSight camera, designed specifically for use with iChat AV. These capabilities are based on the industry-standard, but not yet widely adopted, Session Initiation Protocol (SIP) for video chat and audio chat. The final version of the software was shipped with Mac OS X v10.3 and became available separately on the same day for users of Mac OS X v10.2 for 29.95USD. Apple eventually discontinued sale of iChat AV separately; it can now only be acquired through OS X or with a new Mac.
In February 2004, America Online introduced AOL Instant Messenger (AIM) version 5.5 for Windows-PC users. This version allowed video (but not voice) chats over the AIM protocol and was compatible with Apple's iChat AV. On the same day, Apple released iChat AV 2.1 Public Beta to allow Mac OS X users to video conference with AIM 5.5 users.
In June 2004, Steve Jobs revealed that the next version of iChat AV (commonly called iChat 3) would be included with Mac OS X v10.4 (Tiger). iChat 3 supports up to four people in a video conference and ten people in an audio conference. Additionally, video conferencing uses H.264/AVC, which offers better quality than the H.263 codec used in previous versions. This release also supports the Jabber protocol (which can be directly used to connect to Google Talk and indirectly be used to connect to users of services including Yahoo! Messenger and MSN Messenger as well). However, support is limited as it does not support several common Jabber/XMPP features like account creation, service discovery and full Multi-User Chat support. Despite initial rumors that the client would support tabbed browsing for multiple chat windows (a popular feature available on almost all third-party clients), the released version did not, puzzling many users.
In October 2005, iChat received support for encrypted communications, but only for paid subscribers to Apple's .mac service. These features are part of iChat 3.1, released as part of the Mac OS X 10.4.3 update on October 31, 2005. This version also added support for Jabber multi-user chat.
On August 7, 2006, several upcoming features for the Mac OS X Leopard version of iChat were announced. Major features include iChat Theater, which allows users to share photos and Keynote presentations over a video chat, and "Backdrops," similar to chroma keys, but do not require a green or blue screen, and allow users to insert movies or photos as a backdrop in video chats. Also being added is screen sharing, which will allow two users of Mac OS X Leopard to have control of the same desktop and work collaboratively. Minor features include multiple logins, animated icons, use of Photo Booth effects in live video chat, and tabbed chats.
On June 11, 2007 in addition to the features announced at WWDC 06, it was announced that iChat Theater would be able to show documents that can be displayed on Quick Look. However, even though screen sharing was omitted from the keynote, the button for screen sharing still is on the current Leopard screenshots of iChat.[citation needed]
[edit] Third party add-ons
Several third-party add-ons exist that extend the functionality of iChat.
[edit] ChatFX
ChatFX adds special video effects created by the Quartz Composer application included in Apple's free Developer Tools. ChatFX changes the video in a video conference through use of Quartz Composer compositions. Special video effects like bluescreen, distort, display of desktop, sobel, comicbook, ghost, etc. come with ChatFX but an unlimited number of effects are possible by creating new compositions in Quartz Composer.
[edit] Chax
Chax adds autoreconnect, tabbed windows, and auto-accept of messages and file transfers. Chax also prevents iChat from pausing audio-video (AV) chat when also transferring files. The ability to animate buddy icons, which was absent in versions of iChat before Mac OS X Leopard, can also be added through Chax. It was developed by Kent Sutherland and is similar in functionality to AIM+ and DeadAIM, which added similar features to the Windows version of AOL's AIM client.
[edit] iChatUSBCam
Although an Apple iSight camera is among Apple's requirements for iChat AV video conferencing, iChatUSBCam works around iChat's limitations by enabling the use of USB cameras. It also provides basic picture adjustment and the ability to broadcast the contents of the screen.
[edit] iGlasses
iGlasses gives the user control over the brightness, contrast, and color of the streamed video image. It is especially useful for sub-optimal lighting situations where the iChat user appears too dark, for example. It also provides mirroring and image rotation — useful when an iSight camera is mounted upside down. The "night vision" mode reveals the iSight's high sensitivity. allowing viewing of a darkened room, and making rudimentary security monitoring easier.
[edit] ShowMacster
ShowMacster lets the user stream photos, video, and sound files in their video chat as well as a live view of their screen. ShowMacster also allows "writing" of simple markup onto streamed images -- adding circles, lines, and the like in a set of primary colors and widths. Using a live view of a section of the screen together with this markup capability, a user can do limited whiteboarding, albeit in one direction only. If two (or more) iChat users each use ShowMacster they can communicate their ideas back and forth, but this is not true whiteboarding; the markup is streamed in video only, so there is no shared document which the users both (all) modify, nor is there a way to save the markup.
[edit] See also
- List of Jabber client software
- Comparison of instant messaging clients
- Comparison of instant messaging protocols
- Jens Alfke - the initial developer of iChat
- Video conferencing
- macam - Open source USB webcam driver for Mac.
[edit] External links
- Apple's product page on iChat AV
- Apple's iChat AV Leopard Page
- AOL
- Jabber Software Foundation
- iChat to MSN through Jabber
- iChatUSBCam
- Chax homepage
- ChatFX homepage
- Using iChat AV with a firewall or NAT router
- Portable iChat - Allows you to open iChat as portable application from external drive.
