Local color variations
In some cases, at the edges of area fills, a small number of ink drops may be missing or slightly darker,
producing a local color variation.
These defects are due to the printheads travelling from side to side without printing.
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In each pass, the first 1 or 2 drops of a color are missing or smaller.
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In each pass, the first 1 or 2 drops of a color are darker because they are more concentrated with
pigment.
To resolve these defects, add spit bars at each side of the image, to make sure nozzles are refreshed before
printing each pass. If possible, you could also rotate the image to avoid situations such as shown in the
example.
Color variations when tiling
When tiling, it is important that all tiles have the same length and that the colors of the mating edges match.
This section focuses on color variations; for recommendations about length consistency, see
How to achieve
better consistency between jobs of the same length on page 228.
Possible causes
●
Uniform variations from tile to tile. When color changes uniformly it must be within the color
consistency specification; see
Color consistency on page 27 for more details. Usually grays are much
more sensitive: differences of much less than 2 dE 2000 may be visible, although other colors would not
show a difference.
●
Small color variation left to right. The tile itself looks uniform, but when putting it beside the adjacent
tile the differences become visible.
●
Local color variations. See
Local color variations on page 242. Sometimes these defects become visible
only when printing tiles, showing in one of the tiles but not in the adjacent. They are also more visible
when printing grays.
242 Chapter 10 Troubleshoot print-quality issues ENWW
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