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《图形图象格式一览（list of graphic formats）》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、图形图象格式一览（Listofgraphicformats）Graphicimagefilescanberoughlydividedintotwocategories:oneisbitmapfiles;theotheriscalleddescriptionclass,vectorclassorobjectorientedgraphicimagefile.Theformerdescribesthegraphicimageintheformoflattice,andthelatterisagraphicimagecompose
2、dofgeometricelementsdescribedbymathematicalmethods.Generallyspeaking,thelatterismeticulousandtruetotheimagerepresentation,andtheresolutionofthezoomedimageisunchanged,anditisusedmorewidelyintheprofessionalgraphicimageprocessing.1,dotmatrixgraphicsfile*.bmp(Bitmap)*
3、.bmpisthestandardimagefileformatinWindows,andhasbecometheactualindustrialstandardinPCWindowssystem.Therearetwoformsofcompressionandnoncompression.Itcandescribethebitmapinanindependentway,andstoretheimagedatainuncompressedformat.Ithasfastdecodingspeedandsupportsava
4、rietyofimagestorage.ThecommonPCgraphicsandimagesoftwarecanprocessit.InPhotoShop,youcanuse16McolortorenderBMPimagesatmost.*.dib(DeviceIndependentBitmap)*.dibisagraphicsfileformatsimilarto*.bmp,theabilitytodescribeimagesisbasicallythesameas*.bmp,andcanrunonavarietyo
5、fhardwareplatforms,butthefileislarger.CommonPCgraphicsandimagesoftwarecanhandleit.*.gif(GraphicsInterchangeformat)*.gifisacompressedgraphicsfileformatwhichcanbeprocessedonallkindsofgraphicsprocessingsoftwareonvariousplatforms.Itisastandardbitmapformatthatcanbetran
6、splantedbetweenMacintosh,Amiga,AtatiandIBMmachines.TheformatwascreatedbyCompuserverInc.,withthehigheststoragecolorupto256.Intermsofcolordepthandimagesize,*.gifissimilarto*.pcx;instructure,*.gifissimilarto*.tiff.Becauseitiscompressedimagefileformat,somostlyusedinth
7、enetworktransmission,fasterthanthetransmissionofotherimagefileformatmuchfaster.Thebiggestdrawbackisthatitcanonlyhaveamaximumof256colors,itcannotbeusedforstoringimagefilesoftruecolor,buttheGIF89aformatcanbestoredintothebackgroundtransparentform,andcanbeanumberofsur
8、vivalintoadocument,thusforminganimation.*.png(PortableNetworkGraphics)*.pngisabitmapfileformatthatcanstore32bitsofinformation,anditsimagequalityismuchbe
