HP 5961-0509 manual Empty Row, Duplicate Row, 15-26Raster Graphics

For command byte values 0 - 3, the two <# of bytes/rows> bytes specify the number of bytes (row length) for the row. For command byte values 4 and 5, these bytes identify the number of empty or duplicate rows to print. The maximum value for these two bytes is 65,535; however, the image is clipped to the logical page. Thus, the value of these bytes should not exceed the maximum number of bytes/rows that can be printed on the current logical page size.

If an out of range command byte is encountered, the remainder of the block is skipped, the cursor is not updated, and the seed row is cleared.

Compression methods 0 - 3 are the compression methods used by the Set Compression Method command. Value fields 4 and 5 are features for the adaptive compression method and are explained below.

Empty Row

A command byte of 4, empty row, causes a row of zero’s to be printed. The number of rows printed depends on the value contained in the two <# of bytes/rows> bytes following the command byte. The empty row operation resets the seed row to zero and updates the cursor position.

Duplicate Row

A command byte of 5, duplicate row, causes the previous row to be printed again. The row can be duplicated the number of times indicated by the value contained in the <# of bytes/row> byte.

Duplicate Row updates the cursor position but does not change the seed row.

15-26Raster Graphics EN