Compression rates of 10:1 or 20:1 yield little degradation in image quality.The inclusion of ODF and PDF format support fulfills a promise Microsoft made nearly a year ago, when it said it would let users open, save and edit files in PDFs and the open-source ODF no later than mid-2009. Compression rates of 100:1 can be achieved, although the loss is noticeable at that level. JPEG involves a lossy compression mechanism using discrete cosine transform (DCT). JPEG is a joint standard of the International Telecommunications Union (ITU-T T.81) and the International Organization for Standardization (ISO 10918-1). 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. 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. The JPG format is often used in digital camera memory cards. The resultant 'lossy' file means that quality can never be recovered.

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.

Microsoft Office binary file format specifications.

Free alternatives to Microsoft to open doc files.

doc files can also contain mail merge information, which allows a word-processed template to be used in conjunction with a spreadsheet or database. As PC technology has grown the original uses for the extension have become less important and have largely disappeared from the PC world.Įarly versions of the doc file format contained mostly formatted text, however development of the format has allowed doc files to contain a wide variety of embedded objects such as charts and tables from other applications as well as media such as videos, images, sounds and diagrams. It was in the 1990s that Microsoft chose the doc extension for their proprietary Microsoft Word processing formats. Almost everyone would have used the doc file format, whenever you write a letter, do some work or generally write on your PC you will use the doc file format. Historically, it was used for documentation in plain-text format, particularly of programs or computer hardware, on a wide range of operating systems. Doc (an abbreviation of document) is a file extension for word processing documents it is associated mainly with Microsoft and their Microsoft Word application.

Microsoft office 2007 for macintosh