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Chapter 7 - Troubleshooting 77
5 When plain or other coarse-surfaced paper is
printed in colour, ink is missing from a number of
points on the image.
When paper with a coarse surface is used for full
colour printing, ink will be missing from certain
points where it was difficult to deposit. To correct
this, you can attempt the following.
a Set the Halftone setting in the
More Set-
tings
dialogue box to
Standard Dither
for
printing. The image will be coarse, but the
ink will transfer to the paper more reliably.
b If you have VPhoto Primer ink, the image
quality may be improved by providing an
undercoat.
6 When coloured paper is used for full colour
printing, the colours are not reproduced correctly.
Colour printing is based on the colours repro-
duced when ink is printed on white paper, so cor-
rect colours cannot be reproduced on coloured
paper. DP printers, however, can provide the fol-
lowing forms of printing even on coloured paper:
a On light-coloured paper, DP printers pro-
vide a white undercoat prior to colour print-
ing. This allows colours to be reproduced in
tones close to those obtained by printing on
white paper.
b On dark-coloured paper, impressive finish-
ing may be obtained by using monochrome
printing with white ink.
7 Colour images in the same document look different.
Make sure that you select the same media type
and print mode. The media type presets the most
suitable settings for your document. If you
change the media type or print mode, it will affect
the printed results.
Ink and paper
1 How should I use white ink?
White ink can be used as follows:
a As with foil ink, white ink is effective for
spot colour printing on dark-coloured paper.
b White ink can provide an undercoat for full
colour printing on light-coloured or coarse-
surfaced paper. The white undercoat will
improve image quality and colour reproduc-
tion.
