TH320/TH420
Programmers Guide
53
Merge watermark mode
ASCII
GS 0x8 C n m
Hexadecimal 1D 8C n m
Decimal
29 140n m
Default
0 (off)
This command will insert the logo m as a repeated background image, similar to printing a visible
watermark, into the print stream. The space between repetitions of this usually shaded logo will be every
n*8 dot rows.
n >0 = number of dot rows x8 to skip before repeating the merge action
m specifies the index value of the logo. If no logo has been defined with this index then the command is
ignored.
Note
Horizontal placement of a watermark logo was fixed at the time the logo was Shaded or when it was
downloaded as a full width logo for watermark use. This command will be ignored if the current logo is
not at full paper width size (see the apply shading to logo command for preparing logos for watermark
use).
The merge process is performed after all other image formation and takes whatever print raster data is
ready to be put on paper. It “adds” (computer logic OR) the mono or color bits to the print row. Generally, if
the print dot was to be white or same color as the watermark dot, the print dot will be the color of the
watermark; otherwise it will be black.
Monochrome shade mode
ASCII
GS 0x86
m
Hexadecimal 1D 86
m
Decimal
29 134
m
This applies a selected shade density to all monochrome objects such as text and monochrome logos.
The parameter m specifies the shading effect and has an initial value of 0 which signifies no effect.
m
specifies the percentage of shading, 0 <=
m
<= 100.
m
= 0 is the initial value and turns this mode
off.
Note
That only a few gradations will be perceptible, so large increments of m, such as 20, should be used. If
a reverse print mode is on, the shade effect will be applied to the background only.
When the current color mode is set to black, increasing values of m relate to the relative amount of
(white) paper that replaces black dots. Analogously, when the paper-color is the current color, m
defines the relative amount of color dots being “erased” by white originals of the paper.
Both text and monochrome graphics are affected by this command.
Turning on monochrome shade mode, turns off color shade mode.
Color shade mode
ASCII
GS 0x87 m
Hexadecimal 1D 87 m
Decimal
29 135 m
This applies a mixing of color into any monochrome objects such as text and monochrome logos.
Rather than fading away, this mode transitions a character or logo from the current color in which it
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