EPS stands for Encapsulated PostScript. Files of this format have an .eps extension. The file extension was developed by Adobe Systems in 1992. It is a standard format used to import and export a single page of formatted text, images and graphics. EPS files can be placed with another Postscript file. Commonly used in the publishing industry, an advantage of .EPS is that they are Operating System independent, meaning that the file type can be used to send image and graphics to another recipient regardless of OS. Most EPS files contain a bitmap preview. This allows applications that cannot interpret postscript code to render a low resolution version of the file.
An EPS file must contain at least two DSC (Document Structuring Conventions) header comments. One that confirms that the file conforms to Version 3.0 of the EPS format and also a Bounding Box comment. The Bounding Box comment defines the values that indicate the size of the image to the application reading the file. A number of optional DSC comments can be added depending on the nature of the EPS. For example the %%Begin(End)Preview denotes the bitmap preview section of the file. Another common optional comment is the %%Extensions: comment. This is used to define language extension requirements. The comments section is also used to denote specific font requirements. Note that including multiple extensions limits the portability of the file and therefore where possible an EPS file should be self contained.
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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.
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.
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