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Defect Report Number: 8632-1/034

 

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Submitter: Henderson

 

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Addressed to: JTC1/SC 24/WG 6 Rapporteur Group on ISO/IEC 8632, CGM

 

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WG secretariat: NNI

 

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Date Circulated by WG secretariat: 1 July 1994

 

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Deadline on response from editor: : 1 October 1994

 

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Defect Report concerning IS 8632:1992 Computer Graphics: Metafile for the storage and transfer of picture description information (CGM) Part 1, Functional

specification.

 

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Qualifier (e.g. error, omission, clarification required): Clarification.

 

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References in document (e.g. page, clause, figure and/or table numbers):

p.208, clause 5.7.33

 

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Nature of defect (complete, concise explanation of the perceived problem):

 

The element is PATTERN SIZE, p.208: The 6th paragraph describes how the colors are mapped to the pattern rectangle. In CGM:1987, the rule is properly stated. For the simple default case of default pattern size vectors (height is up and width is right), the first nx colors form the top row of the pattern, the 2nd nx colors form the second row, ..., the last nx colors form the bottom (ny-th) row.

 

1 2 3 ... nx

nx+1 nx+2 nx+3 2*nx

2*nx+1 2*nx+2 2*nx+3 3*nx

...

(ny-1)*nx+1 ... ny*nx

 

(Fill Reference Point is bottom left)

 

There is a major editorial error in CGM:1992, in which about half of the 3rd sentence disappeared. No one noticed this in all of our proof reading. The statement does not now completely describe a mapping. It is almost impossible to make a mapping that is

consistent with the information presented. However there is one mapping which is consistent with the incomplete information. Unfortunately, this mapping is the transpose of the correct mapping.

 

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Solution proposed by the submitter (optional):

Part 1, Page 208, 3rd sentence: Replace the sentence with, "Colour array elements with increasing first dimension are associated with successive cells in the width direction, and colour array elements with decreasing second dimension are associated with successive cell in the direction of the height vector." This is exactly as in CGM:1987.

 

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Editor's response (any material proposed for processing as a technical corrigendum to, an amendment to, or a commentary on the International Standard or DIS final text is attached separately to this completed report):

 

Amend the standard as proposed above.