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|Description||Files with a .key extension are created by Apple's "Keynote" application which forms part of Apple's iWork office suite, a set of applications which run on the Mac OS X and iOS operating systems, and also includes Numbers (for spreadsheets) and Pages (for word processing).
Keynote began life in 2002 as an internal Apple tool developed for Steve Jobs to help him present at MacWorld. The first version was made available to the public in 2003 as Keynote 1.0 and was designed to compete with Microsoft's Powerpoint presentation software which formed part of Microsoft Office.
Designed to let users easily create, play and share presentations, Keynote contains most of the features found in modern presentation software, such as a slide navigator, the ability to add tables, shapes and charts to slides and a powerful media browser which allows users to drag and drop music from from iTunes, and photos from iPhoto and Aperture into their slides.
Keynote contains a large number of pre-designed themes to let users select common presentation formats, and powerful graphics tools to manipulate embedded images and provide advanced 3D transitions between slides (powered by OpenGL). The major Keynote releases are summarised below:
|Actions||KEY to JPG - Convert file now
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|Technical Details||Official file format specifications for iWork Keynote files are not published by Apple, but it is still possible to look at a developer document Apple released for iWork '05 file formats.
A .key file is actually a compressed ZIP file comprised of a number of other different files combined that together make up a .key file. The most recent version of Keynote saves files with an "Index" directory containing Apple's proprietary IWA file format, a "Metadata" directory with .plist files, a "Data" directory with image assets (e.g. backgrounds and photos used in slides) and one or more jpg files for allowing quick previews.
Files created by Keynote in iWork cannot be opened by programs other than iWork.
|Associated programs||Apple iWork
|Developed by||Apple Inc|
|Useful links||Keynote details on Wikipedia
Keynote supported file formats
Ars Technica review of iWork '14
Tim Bray on the early history of the Keynote file format
Apple iWork product page
Keynote file format compatibility
|Description||JPG's are often used for web sites and email as they are generally smaller file sizes as they are lossy meaning that some image quality is lost when the JPG is compressed and saved. The resultant 'lossy' file means that quality can never be recovered. The JPG format is often used in digital camera memory cards. The JPG file is a great format as it often manages to compress files to 1/10 of the size of the original file which is especially good for saving on bandwidth.|
View other image file formats
|Technical Details||JPG is a graphical file format for editing still images, it offers a symmetrical compression technique which is processor intensive and time consiming in both compression and decompression. JPEG is a joint standard of the International Telecommunications Union (ITU-T T.81) and the International Organization for Standardization (ISO 10918-1). JPEG involves a lossy compression mechanism using discrete cosine transform (DCT). Compression rates of 100:1 can be achieved, although the loss is noticeable at that level. Compression rates of 10:1 or 20:1 yield little degradation in image quality.|
|Associated programs||Adobe Photoshop
Corel Paint Shop Pro
Microsoft Windows Photo Gallery Viewer
|Developed by||The JPEG Committee|
|Useful links||More detailed information on JPG files
Choosing the best way to compress a JPG file
Convert KEY file
- key to html (Hypertext Markup Language)
- key to jpg (JPEG compliant image)
- key to key09 (Apple iWork '09 Keynote Document)
- key to mov (Apple QuickTime Movie)
- key to pdf (Portable Document Format)
- key to png (Portable Network Graphic)
- key to ppt (Microsoft PowerPoint Presentation)
- key to pptx (Microsoft PowerPoint 2007 Presentation)
- key to tiff (Tagged image file format)