Panasonic PT-L701SDE Operating Instructions Manual

Contents

Panasonic PT-L701SDE Operating Instructions Manual Manual pdf 9 page image

9Explanation of termsFollowing are definitions for some of the terms used throughout these Operating Instructions.PowerPointApplication software for creating presen-tations which is included as part ofMicrosoft Office. 95, 97 and 2000 ver-sions are available, but the JPEGConvertor software which is bundled withthe projector is only compatible with the97 and 2000 versions.JPEGAbbreviation for Joint PhotographicExperts Group. JPEG is the name of aninternational organisation which wasjointly established by the ISO and theITU-TS (formerly the CCIT), but the termis normally used to refer to the specifica-tions for the still picture compressionalgorithm which was formulated by theJPEG. This algorithm allows still imagessuch as photographs, single frames ofmoving images and scanned images tobe compressed to up to 1/100th of theiroriginal sizes. However, images which arecompressed in this way cannot be fullyrestored to their original quality (somedeterioration in quality occurs), so thatcompression rates of 1/5 to 1/30 arenormally used. Because of differences incolour separation, two format sub-typesare used: RGB (red, green and blue) andCMYK (cyan, magenta, yellow, black).The projector and the JPEG Convertorsoftware do not support the CMYK sub-type of JPEG file.BMPAbbreviation for BitMaP. This is thestandard image format for the bitmappedfiles (image files consisting of a collectionof dots) which are handled by Windows.Colour levels of monochrome, 16 colours,256 colours and 16.7 million colours aresupported.RLEAbbreviation for Run Length Encoding. Itcan be used to achieve high rates ofcompression for image files which containlarge areas of a single colour. RLE can beused with monochrome, 16-colour and256-colour BMP image files. (JPEGConvertor does not support files com-pressed using RLE.)TIFFAbbreviation for Tagged-Image FileFormat. This type of file is used toexchange documents between comput-ers. Colour levels of monochrome, 256colours and 16.7 million colours aresupported. TIFF files in 16.7 million colourformat can include transparent colour.LZWAbbreviation for Lempel-Ziv-Welch. LZWis a compression method used for TIFFfiles, and is named thus because it wasdeveloped by three people namedLempel, Ziv and Welch. It compresses thefiles by converting patterns within theimages into short codes. There is nodeterioration in image quality resultingfrom compression, but high rates ofcompression which are comparable toJPEG files cannot be expected to beobtained. (JPEG Convertor does notsupport files compressed using LZW.)DCFAbbreviation for Design rule for CameraFile system. DCF is a standard which wasestablished by the Japan ElectronicIndustry Development Association(JEIDA) with the aim of realising acommon image file format, directoryname format and file name format for theimages used with digital still cameras. It isbased on recommendations such as ExifVersion 2.1.Exif 2.1Abbreviation for Exchangeable Image FileFormat. This is an image file format whichwas established by the Japan ElectronicIndustry Development Association(JEIDA). It defines the common informa-tion format and range of application forimages used with digital still cameras,centring around TIFF and JPEG-formatimages. Version 2.1 is the latest version ofthe Exif standard.