PPSX is a PowerPoint Open XML Slide Show - it is primarily designed to be non-editable and to simply playback the Powerpoint presentation. It differs from PPTX which allows for the file to be editable. The 'X' extension refers to Microsoft Office 2007, 2010 and 2012 which ZIP compress the file and is therefore different from the previous versions which were generally have larger file sizes.
PPSX are compressed and based on the ECMA-376 standard for Office Open XML. It supports Text, Images, Audio and Video and is stored in a zipped directory format which matches the OPC structure. Just like the PPTX format the PPSX format improves file sizing, data recovery and data management and allows for other applications to interact with it due to the XML structure.
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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