Specifications

Image Quality
Copyright © 2009 BERTL Inc. September 25, 2009
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Page 21
August 2009
RISO ComColor 9050
www.BERTL.com
an indication of the device’s ability to produce gradients and
halftones and maintain a clean edge with curved fine lines.
The most extreme portion of the dot quality evaluation is the
ability of the device to print both negative and positive 1- and
2-pixel dots.
Negative/Positive Dots*
Line Width (points) % of Dots Printed
1 pixel Cyan 100
1 pixel Yellow 100
1 pixel Magenta 100
1 pixel Black 100
1 pixel Black Neg 100
2x2 pixel Black 100
2x2 pixel Black Neg 100
Checkerboard apparent? No
*On a scale of 0 – 100%. The higher the percentage, the better.
Other elements of the BERTL DTP are a
series of negative, positive and color lines in
various widths. A series of diagonal lines is
used to evaluate stair stepping (ragged
edges or “jaggies”), while a grid composed of
colored lines is used to evaluate color
trapping of the intersecting lines.
Test Result – The RISO ComColor® 9050
was able to
produce prints of black at 2-pixel
prints while the cyan,
magenta, and yellow were accurately reproduced at 1 pixel.
The RISO ComColor® 9050 also accurately printed negative
and positive lines of various widths. The RISO ComColor®
9050 prints did display some small visible stair stepping of the
negative and positive diagonal lines of various widths.
Negative/Positive Lines*
Line Width
(points)
Negative Positive
Vertical Horizontal Vertical Horizontal
1
√ √ √ √
2
√ √ √ √
3
√ √ √ √
4
√ √ √ √
5
√ √ √ √
6
√ √ √ √
A “√” mark indicates the device was able to print the line width correctly.
*Chart cells containing an “x” indicate that the printer was not able to
print the line width correctly. Overall, the fewer “x’s,” the better the
image quality. If no cells are marked with an “x,” then the device was
able to print all line widths correctly.
GRAYSCALE
Along with precise dot control, a printer’s ability to produce
seamless grayscale images is the key to its ability to produce
today’s complex documents that contain a mix of illustrative
and photographic elements. Additionally, the ability to produce
high-quality halftones more often than not precludes the use of
expensive color images in most documents—a key to
controlling the cost of printing. BERTL designed components
of the DTP specifically for the evaluation of halftone quality:
• Grayscale and color versions of ISO
synthetic or natural images are included so
that BERTL can evaluate the ability of the
device to convert and print a color image
versus print a grayscale version of the same
color image.
• Linear grayscale strips were printed in order to evaluate
smooth transitions between gradations.
• Grayscale linearization prints are used to precisely identify
the tonal values where linearization is inconsistent.
• A professional photo montage is mixed
with challenging contrasted images and
geometric elements in order to evaluate
the device’s ability to regulate print
contrast over a wide range of
conditions, all on a single page.
Test Result - BERTL technicians examined every grayscale
element in the printed DTP and found dark and over-saturation
through several sections of the images evaluated. However,
the RISO ComColor® 9050 features many image-quality
adjustments, and BERTL feels that grayscale color saturation
and darkness can be tailored to suit virtually any application.
IMAGE REGISTRATION
One element of BERTL’s DTP features is designed to
specifically address the evaluation of registration. Two
identical images are laid out on consecutive pages in the
DTP. BERTL technicians analyze the printed output to
evaluate front-to-rear, top-to-bottom, side-to-side and sheet-
to-sheet registration. imageXpert test charts are printed font-
to-back in order to evaluate image registration.
imageXpert printer image-quality test charts
Test Result - BERTL technicians evaluated a number of
documents printed by the RISO COMCOLOR® 9050 and
found that front-to-rear (duplex) registration and sheet-to-