HP PCL 5 User Manual download pdf (Page 35)

EN Using Color Modes 2-11

MODE 3: DIRECT BY PIXEL

This mode specifies a pixel as three, eight-bit components, thus the

name 24-bit direct color. Assuming the RGB color space with the

mandatory eight bits per component, the underlined bytes below

define the first pixel of row two.

Example:

In the example below the data in the row transfer commands are

shown as two-digit hexadecimal numbers for clarity, even though the

actual data would be byte-aligned binary data. The example is for a

one-pixel-wide image.

Byte 2 (Number of Bits per Index)

This command creates a palette regardless of the PEM chosen. This

byte determines the size of the created palette. The palette size is two

raised to the power of n (2

), where n is the bits per index.

• In the Indexed-by-Plane PEM, where the raster data is

interpreted as palette indices, this value determines the

number of planes required per row.

?*b#W row 1 r7–r0 g7–g0 b7–b0 . . .

?*b#W row 2 r7–r0 g7–g0 b7–b0 . . .

?*b#W row 3 r7–r0 g7–g0 b7–b0 . . .

?*v6W 00 03 00 08 08 08 Binary Data for CID command

represented in hexadecimal.

This command sets the color

space to RGB, the PEM to

Direct by Pixel. The palette size

is ignored. The last three bytes

must be 8.

?*r1A Start raster

?*b3W 45 06 30 The three bytes specify a single

pixel. The first sets 45 as the red

component’s value, the second

sets the green value to 06, and

the third sets the blue value to

30.

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 285 286

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HP PCL 5 User Manual Page 35