Brother  HL-4140CN, Technical Reference Manual

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CHAPTER 3 PCL5C - 15
5.3. Set Gamma Correction
Command
ESC*t#I (27)(42)(116)#(73) <1Bh><2Ah><74h>#<49h>
# = 0.0 ~ 32767.0 (command is ignored for invalid values)
Default value = 0 (gamma correction off)
This command does not destroy the contents of the current palette, but setting a gamma value replaces any
lookup table input in either Device CMY or Device RGB.
5.4. Download Dither Matrix
Command
ESC*m#W [data] (27)(42)(109)#(87) <1Bh><2Ah><6dh>#<57h>
Range = 7 ~ 32767 (Any other value is ignored.)
# stands for the number of pattern data bytes.
 This command specifies a single matrix for the R, G, and B colors.
 The dither which is specified by this command is valid when selecting the # value to 9 or 10 with the Set
Render Algorithm command.

The table below shows the format for a dither matrix that is applied to all three primary colors.
MSB LSB
0 - 1 Format (0) Number of planes (1)
2 - 3 Dither matrix height in pixels
4 - 5 Dither matrix width in pixels

Format: set to 0.
 Number of planes: set to 1.
 Dither matrix height in pixels: specifies the dither matrix height by the number of pixels.
 Dither matrix width in pixels: specifies the dither matrix width by the number of pixels.
** The values for 'Dither matrix height in pixels' and 'Dither matrix width in pixels' should not be 0.
The multiple of these two values should not be more than 32767.
5.5. User-defined Pattern Command
Command
ESC*c#W (22)(42)(99)#(87) <1Bh><2Ah><63h>#<57h>
Range = 0 ~ 32767.
# stands for the number of pattern data bytes.
MSB LSB
0 - 1 Format (1) Continuation (0)
2 - 3 Pixel Encoding (1/8) Reserved (0)
4 - 5 Height in Pixels
6 - 7 Width in Pixels
8 - 9 Pattern Image
 Format: set to 1. This command downloads the color pattern.
NOTE: If the Format is set to 0 or 20, it sends monochrome format. For details, refer to 'Chapter 2 PCL'.
 Pixel encoding: set to either of 1 bit or 8 bits. If selecting 1 bit, 1 pixel is assigned to 1 bit (2 colors).
If selecting 8 bit, 1 pixel is assigned to 8 bits (256 colors).
 Height in pixels: specifies the pattern height by the number of rows.

Width in pixels: specifies the pattern width by the number of pixels.
 Pattern Image: sends the pattern image data as an index number of the palette. It uses the colors of
the current palette when the pattern is used.