MIL-STD-2301 Computer Graphics Metafile Cgm Implementation Standard For The National Imagery Transmission Format StandardThis standard establishes the requirements necessary to implement Computer Graphics Metafiles CGM used for the representation of symbol graphics in the National Imagery Transmission Format Standard NITFS.

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MIL-STD-23O1A

TABLE CXXV. Arc Closed example - Continued.

CGM ELEMENT	HEX VALUES
INTERIOR STYLE	Ox5O62 OxOOO6
FILL COLOR (255,O,O)	Ox5O83 OxOOOO OxFFOO
EDGE VISIBILITY (on)	Ox53C2 OxOOO1
ELLIPTICAL ARC CLOSE (1O,1O 1O,5 2O,1O, 15,5 5,5)	Ox4276 OxOOOA OxOOOA OxOOOA OxOOO5 OxOO14 OxOOOA OxOOOF OxOOO5 OxOOO5 OxOOO5 OxOOOO
END PICTURE	OxOOAO
END METAFILE	OxOO4O

6.2 Color to gray scale conversion. Full color may be specified for Attribute Elements dealing with color. Color items for receiving systems unable to support full color must be mapped to colors they are able to support.

For eight-bit gray scale systems:

pixel value8 = O.299 * RED + O.587 * GREEN + O.114 * BLUE For one bit black and white systems:

pixel value1 = 1 (white), if pixel value8 > 127

O (black), if pixel value8 < 127

6.3 Subject term (key word) listing.

Image

Picture

Secondary Imagery Dissemination System

SIDS Symbol(s)

6.4 Changes from previous issue. Marginal notations are not used in this revision to identify changes

with respect to the previous issue due to the extent of the changes. The following is a list of features that have been added to the NITFS CGM implementation as described in this document.

a. New Metafile Description

This revised standard defines a new metafile descriptor (NITF/CGM;ProfileED:23O1-

2/Source:producer;Date:YYYYMMDD) to align it with the international standard upon which this standard is based. For legacy purposes, the previous metafile (NITF/CGM-APP-2.O) may