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Explanation:
This command sets the threshold values for user-defined dither
patterns. The patterns defined with this command can be selected by
the ESC B command.
Parameter i can be 0 or 1, allowing you to define two dither patterns.
Parameter j determines the number of pixels on one side of the dither
matrix square. The square can be 4 × 4, 8 × 8, or 16 × 16 pixels.
Parameter d is data representing the threshold values of the pixel
positions in the matrix. The number of bytes of threshold data is
determined by parameter j, and should be j
2
bytes. For example, when
j = 4, the threshold data required is 16 bytes ; and when j = 8, the
threshold data required is 64 bytes.
The threshold data assigns threshold values to pixel positions in the
matrix from top left to bottom right, as shown below. Since the value
of the input image data can range from 0 (dark) to 255 (bright), each
byte of threshold data can take a value ranging from 0 to 255.
An example of a 4 x 4 spiral pattern is shown below.
Command Reference 3-51