CGM

Full Name	Computer Graphics Metafile
Format ID	ImGearFormats.CGM
File Extension(s)	*.cgm
Data Type	Metafile Vector Image
Data Encoding	Character-based, Binary, Clear-text encoded
IG Multipage Support	Yes
IG Alpha Channel Support	No
IG Metadata Update Support	No
IG Platforms Support	Win32, Win64, .NET, .NET64

CGM format requires ImageGear.Formats.CGM Namespace.

ImageGear Supported Versions

Version 1 (1987 standard)
Version 2
Version 3 (1992 standard)

ImageGear Supported Features

IGFilterFormatFlags.DETECTSUPPORT - autodetection
IGFilterFormatFlags.PAGEREADSUPPORT - single page file reading
IGFilterFormatFlags.PAGEINSERTSUPPORT - single-page file writing
IGFilterFormatFlags.IG_FLTR_MPAGEREADSUPPORT - multi-page file reading

ImageGear Read Support

ImGearCompressions.NONE - Vector/CAD data

ImageGear Write Support

ImGearCompressions.NONE - Vector/CAD data

Please see ImageGear Supported Vector Format Features > CGM for more information.

ImageGear Filter Control Parameters

Filter Control Parameter	Type	Default Value	Available Values	Description
Width	Long	512	Any positive value	Defines the DIB width of the loaded image. The DIB height is calculated using the file's scale factors.

Comments

This is standardized, platform-independent format used for the interchange of bitmap and vector data.

CGM is a very feature-rich format which attempts to support the graphic needs of many general fields (graphic arts, technical illustration, cartography, visualization, electronic publishing, and so on). While the CGM format is rich in features (many graphical primitives and attributes), it is less complex than PostScript, produces much smaller (more compact) files, and allows the interchange of very sophisticated and artistic images.

Computer Graphics Metafile was developed by experts working on committees under the auspices of the International Standards Organization (ISO) and the American Standards National Institute (ANSI). It was specifically designed as a common format for the platform-independent interchange of bitmap and vector data, and for use in conjunction with a variety of input and output devices. Although CGM incorporates extensions designed to support bitmap (called raster in the CGM specification) data storage, files in CGM format are used primarily to store vector information. CGM files typically contain either bitmap or vector data, but rarely both.