Brother QL-720NW - Manual (Page 71)

ESC/P Command Reference
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5. Control Command Details
ESC L 8-dot double-density bit image
ASCII: ESC L n1 n2 Data
Decimal: 27 76 n1 n2 Data
Hexadecimal: 1B 4C n1 n2 Data
Parameters
0≤n1≤255, 0≤n2≤3
The data contains n1+n2*256 bytes of image data.
Description
Specifies that an 8-dot double-density bit image is printed with the number of dot positions indicated by n1
and n2.
 n1 and n2 are specified in the same way as with ESC K.
 First, the data is lined up in one row as follows:
1b
yte
1b
yte
1b
yte
1b
yte
…
1b
yte
1b
yte
n1+n2*256 bytes
MSB
LSB
 One dot of image data is enlarged to 6 dots vertically by 3 dots horizontally.
 As a result, the image is 48 dots vertically by (n1+n2 *256)*3 dots horizontally.