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spectacular B&W photos on glossy and semi-gloss photo media without using color inks that can
cause color casts and metamerism.
HP 70 Photo Black Ink in the HP
Designjet Z3100 achieves a
minimum L* of 3.5 (Dmax = 2.43)
on glossy photo paper
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that
significantly exceeds the black point
of silver halide prints on RC paper.
HP 70 Matte Black and HP 70
Photo Black Inks together deliver an
outstanding minimum L* of 14
(Dmax = 1.77) on matte fine art
media.
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Pigment inks contain resins that f
a thin coating that binds pigme
particles to the paper’s surface.
thickness, gloss, and transparency
of this coating can depend on the colors and amounts of ink used. Printing with pigments on
glossy and semi-gloss photo papers involves two effects that are not significant on matte media:
gloss uniformity and “bronzing”.
orm
nt
The
Obtaining uniform gloss on photo media is a challenge, because ink gloss in the midtones and
shadows must match the paper’s gloss in the highlights. Otherwise, white areas in the image
might appear as dull or shiny patches at some angles of view.
Bronzing appears as an unwanted metallic luster and changes in perceived density and tone in a
printed image. It is caused by interference between rays of light that reflect off the surface of the
ink layer and others that pass through it to reflect off the ink-paper interface.
In the past, some photographers and graphic artists have eliminated both gloss uniformity and
bronzing issues by laminating prints with a liquid or spray coating or displaying prints behind
glass.
In HP’s 8-ink Vivera pigment ink system for the HP Designjet Z2100, HP chose the resin, pigment
loads, ink vehicle, and print modes to deliver excellent gloss uniformity and low bronzing on
glossy and semi-gloss photo media without lamination. HP's 12-ink system for the HP Designjet
Z3100 takes gloss uniformity and suppression of bronzing even further to meet the needs of the
most demanding professional photographers.
HP’s 12-ink system includes an important innovation, HP 70 Gloss Enhancer. It is
used on glossy and semi-gloss photo media to produce images with uniform gloss from
highlights to shadows, and eliminates bronzing as an image quality issue without the need
for film, liquid, or spray lamination. The amount of HP 70 Gloss Enhancer used in each pixel
depends on the color and amount of other inks. HP 70 Gloss Enhancer is not a liquid laminate or
coating, and it is printed with other inks in toned regions and on paper white in the brightest
highlights.
While other pigment inks can appear to be a coating on the surface of photo papers, HP’s 12-ink
system with HP 70 Photo Gloss produces a luminous image that appears to be in the paper, not
on top of it. This gives prints a look much appreciated by professional photographers and their
clients.
HP Multi-Color Separation Technology
To produce professional-quality prints, it is simply not enough to offer more ink colors - it is how
they are used together that’s critical to producing the best images. Most printable colors can be
matched by many different ink combinations. A method for separating CMYK or RGB inputs into
12 inks has a number of critical performance objectives. It must produce a wide and useful
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Measured on HP Premium Instant-Dry Gloss Photo Paper using HP 70 Photo Black ink.
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Measured on HP Hahnemühle Smooth Fine Art Paper using HP 70 Photo Black and HP 70 Matte Black inks.
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