HP L 5 manual Example, PEM 0 Indexed by Plane

PEM 0: INDEXED BY PLANE

In Pixel Encoding Mode 0, successive planes of data are sent for each raster row. A plane contains one bit for each pixel in a row. A pixel is not fully defined until all the planes for that row have been received, which is signaled by a transfer raster row command. The planes in a row form index numbers into the current palette. For example, assuming three bits per index, the underlined column of bits in the figure below is the palette index for pixel three of the first row (i1 is the least significant bit, i3 is the most significant bit). Note that the Transfer Raster Data by Plane command (?*b#V) is used for all planes except the last plane of each row, which is sent using the Transfer Raster Data by Row command (?*b#W).

?*b#V	row 1	plane 1	i1	i1	i1	i1	i1	i1
?*b#V		plane 2	i2	i2	i2	i2	i2	i2
?*b#W		plane 3	i3	i3	i3	i3	i3	i3
?*b#V	row 2	plane 1	i1	i1	i1	i1	i1	i1

Example:

In the example below, the row transfer commands are shown in binary for clarity, even though the actual data would be byte-aligned binary data. The example is for an eight-pixel-wide image.

?*v6W 00 00 03 08 08 08	Binary data for CID represented
	in hex. This command sets the
	color space to RGB, the PEM to
	Indexed by Plane, the palette size
	to 8 (23). The last 3 bytes are
	ignored.
?*r1A	Start raster.
?*b1V10110000	Transfer plane 1 (the first bit for
	each pixel in the first row).
?*b1V01110000	Transfer plane 2 (the second bit
	for each pixel in the row).
?*b1W10101000	Transfer plane 3 (the third and
	final bit for each pixel in the row)
	and move to the next row. Note
	that the ?*b#W command is
	used to send the last plane of
	each row.

2-8 Using Color Modes EN