DECGRA (")

Set Raster Attributes: Defines the pixel aspect ratio, overriding Ps1

 

of the protocol selector. DECGRA also defines the extent (size) of the

 

raster. Level 3 printers ignore the extent parameters.

 

Format

 

 

 

“ Pn1 ; Pn2 ; Pn3 ; Pn4

 

Description

 

 

 

This command must precede picture-definition information requiring

 

an aspect ratio: sixel printable characters (sixel data, 3/15-7/14), the

 

Graphics New Line (DECGNL) command and, by extension, Graphics

 

Repeat Introducer (DECGRI) and Graphics Carriage Return

 

(DECGCR). Otherwise, this command is ignored. If multiple DECGRA

 

sequences are received, only the last one is accepted.

 

 

 

 

 

 

 

Parameter

Description

 

 

 

Pn1

Pixel aspect ratio numerator

 

 

 

Pn2

Pixel aspect ration denominator

 

 

 

Pn3

Horizontal extent

 

 

 

Pn4

Vertical extent

 

Pn1 describes the vertical size of a pixel in an arbitrary distance unit. Pn2 describes the horizontal size of a pixel in the same distance unit. For example, to define a pixel to be half as wide as it is tall, send 200; 100 for Pn1 and Pn2.

The pixel aspect ratio times the horizontal grid size (Ps3 of the protocol selector) yields the vertical grid size.

Pn3 and Pn4 define the horizontal and vertical extent, respectively, in pixels. Level 3 printers ignore these parameters. Page composition software can include these parameters for compatibility with video terminals.

Error Handling

If Pn1 or Pn2 is greater than 32K, the value 32K is used. If Pn1 or Pn2 is 0 or omitted, the printer sets it to 1.

The maximum aspect ratio supported by the printer is 1: 10 or 10: 1 (after reducing the ratio to the lowest possible format).

The maximum parameter implemented for DECGRA is 999 (decimal).

If the Set Raster Attributes sequence is received after a sixel printable character or another sixel control code is received, the command is ignored.

Any additional parameters received are ignored.

GEK-00029B

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5000 Series Programmer’s Manual

Page 259
Image 259
Genicom GEK 00031B manual Decgra, Parameter Description

GEK 00031B specifications

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