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Analyze of Image Quality of Ink Jet
Printouts
L.Buczyński (a), B. Kabziński (a), D. Jasińska Choromańska, (a)
(a) Warsaw University of Technology , Institute of Micromechanics and
Photonics, A. Boboli 8, 02-525 Warsaw, Poland
Abstract
This paper describes factors influencing quality of digital printing, how
each parameter changes quality.
Introduction
In recent years there is a rapid growth of ink jet printers appliance. It is a
result of widespread introduction of digital printing, development of production
engineering of ink jest printing, modern inks and photo-quality
papers for printing.
As a result, a role of ink jet printouts quality rating is increasing, especially
objective printout quality estimation and normalization of its control methods.
Development of ink jet color printing techniques requires analysis of influence
on printouts quality of new print technology, properties of newly introduced
printing materials(ink, papers), construction of ink jet mechanisms,
control systems of printing and color management.
Leading producers are constantly developing their printing improving systems.
Analysis of ink jet printouts would allow to estimate the efficiency
of introduced improvements and would show directions of further quality
estimation development of printouts.
Factors influencing the quality of the ink jet printouts
The quality of color printouts is influenced by many factors which are
linked between each other. The main goal is to reduce volume of ink
drops. While printing in thermal ink jet printing technology color points
consist of many small ink drops (each different volume). Using piezo Ink
jet printing technology, volume of ink drops is also differentiated and
grouping into 2 or 3 in a set to achieve better saturated images.
Reducing the volume of ink drop and simultaneously increasing its number
has also negative consequences, because it increase time of input data
computing and positioning a ink drop on the paper, the result: printing
process lasts longer.
Another important quality parameter of ink jet printing is increasing the
number of compound colors. Adding light grey (LG), light light grey
(LLG), light cyan (LC), light magenta (LM) colors to basic color set
CMYK, extends color gamut of printed images.
Such printed photos require appropriate color pigments and photo papers,
complicates printer control process and color management system.
Quick development of supplies materials (inks and papers) is observed.
Commonly used solvent and pigment inks are gradually modified and improved
by producers. Except colorants, inks include additional components
improving ink jet process and color stability. Moreover, key meaning for
enhancing printing quality is developing form of printer input file (RIP)
and color management systems. .