6.3.13. Horizontal 1200-dpi image format mode (Raster Graphic Mode 1027)- Page 119

Brother HL-5050 Command Reference Guide for Software Developers

Table of Contents

Technical Reference Guide
GLOSSARY
background image

 

CHAPTER 2 PCL - 99 

<Compressed Image Data> 

Data compression compresses the original image data word by word (16 bits). 

The compressed data consists of both horizontal compression which uses 16 bit, 8 bit and 4 bit repeating 
patterns within 1 word or 2 words of data and vertical compression which indicates how many times to repeat 
the same data as in the previous line within 1 word of data. 

 

ï‚Ÿ

 Non-compressed data 

When the most significant bit in the first 2 bytes is 0, the printer goes into non-compression mode. The 
following 11 bits then indicate the number of words of data, the least significant 4 bits are not used. After that, 
the image data follows word by word. 

 

 

   15    14 

 

 

 

 

   4   3   

   0 

data word count (11 bits) 

not used 

data 1 (16 bits) 

data n (16 bits) 

 

ï‚Ÿ

 16 bit repeating compressed data 

When the most significant 3 bits in the first 2 bytes are in the order 1, 0, 0, the remaining 13 bits indicate the 
number of times to repeat 16 bit data. The following 2 bytes should be the 16 bit data to repeat. 

 

 

   15     14    13    12 

 

 

 

 

 

  0 

number of repeats(13 bits) 

data to repeat(16 bits) 

 

ï‚Ÿ

 8 bit repeating compressed data 

When the most significant 3 bits in the first 2 bytes are in the order 1, 1, 0, the following 5 bits indicate the 
number of times to repeat 16 bit (two by 8 bits) data. The remaining 8 bits should be the 8 bit data to repeat. 

 

 

   15    14    13    12 

 

           8    7 

 

number of repeats 

data to repeat(8 bits) 

   (5 

bits) 

 

ï‚Ÿ

 4 bit repeating compression data 

When the most significant 3 bits in the first 2 bytes are in the order 1, 0, 1, the following 4 bits are the 4 bit data 
to repeat. The remaining 9 bits indicate the number of times to repeat the 16 bit (4 by 4 bits) data. 

 

 

   15    14    13    12 

 

           9    8 

 

data to repeat 

number or repeats(9 bits) 

   (4 

bits) 

 

ï‚Ÿ

 Vertical repeating compressed data 

When the most significant 3 bits in the first 2 bytes are in the order 1, 1, 1, the remaining 13 bits indicate the 
same data words as in the previous line. 

 

 

   15    14    13    12 

 

 

 

 

 

the same data words as in the previous line (13 bits) 

 

The printer cannot support the APT and HRC function in the 1200 dpi printing mode. 

 

 

Detailed Information for Brother HL-5050 Command Reference Guide for Software Developers

Related Documents for Brother HL-5050 Command Reference Guide for Software Developers