XJ128 and XJ128 Plus Printhead
XJ128 Guide to Operation
Xaar Document no: D031010302 Version A
Page 52
9.2.3 Changing colour space
Once the image has been correctly sized it must then be converted to be displayed in the printing
format CMYK (if required) or monochrome for printing with a single head. This can be performed by a
number of pieces of image processing software including Photoshop
.
Photoshop
example:
Ensure the correctly sized image is selected
From the
‘
Image
’
menu select the
‘
Mode
’
menu
and
then
‘
CMYK
colour
’
or
‘
Grayscale
’
for a monochrome image
Figure 9.4 Image mode change in Photoshop
Note: A colour image can only be converted into a
‘
greyscale
’
format and not directly into the
required printing format
–
a 1-bit bitmap. When colour channels are split further into the process (see
‘
Splitting ink channels
’
section) the output will be the required format.
9.2.4 Ink control
The printed output from a binary printhead will depend on the substrate used, which will define the
amount of drop spread.
For some applications such as coding and marking a substrate should be chosen that allows good
coverage of a single ink colour.
For other applications such as colour printing of a photo-type image a substrate should be chosen to
allow single and mixed colours to achieve acceptable coverage.
As a further step the pixel values in a digital image may be suppressed to suit the substrate to be
printed on to.
This can be performed by a number of pieces of image processing software including Photoshop
,
where a curve can be applied.
