Photo paper is a category of inkjet paper designed specifically for
reproduction of photographs, which is extremely bright white due to bleaching
or substances such as titanium dioxide, and has been coated with a highly
absorbent material that limits diffusion of the ink away from the point of
contact. Highly refined clay is a common coating to prevent ink spread.
The best of these papers, with suitable pigment-based ink systems, can
match or exceed the image quality and longevity of photographic gelatin-based
silver halide continuous tone printing methods used for color photographs, such
as Fuji CrystalArchive (for color prints from negatives) and
Cibachrome/Ilfochrome (for color prints from positive transparencies). For
printing monochrome photographs, traditional silver-based papers are widely
felt[by whom?] to retain some advantage over inkjet prints.
Photo paper is usually divided into glossy, semi-matte, semi-gloss,
"satin" or "silk", and matte finishes. The thickness of
photo paper varies over a wide range. The lighter weights are not much
different from general-purpose office papers as described above, and can be
used for all types of printing, although these are the least expensive
lowest-quality photo paper.
Photo papers for more critical work are thicker and have advanced
coatings, sometimes with quick-drying properties. They can normally be printed
only on the one specially coated side. A few papers are coated for double-sided
printing.
Glossy photo paper, which is generally the most popular, has a shiny
finish that gives photos a vivid look. It will generally be smooth to the touch
and will have some glare to it. Matte photo paper is less shiny and has less of
a glare than glossy paper. It is often used to produce superior text results.
Matte and glossy prints will typically feel different to the touch, but when
displayed under glass their results will often look quite similar. To increase
the resemblance to oil paintings, papers with an imitation canvas texture are
available. Photo papers are usually high-brightness neutral white papers, but a
few off-white papers are made.
As in offset litho printing and traditional photographic printing,
glossy papers give the highest color density (or Dmax), and therefore the
widest color gamut. Photo papers vary in their longevity and their color gamut.
Ink suppliers often provide color profiles for their ink systems when used with
specific papers. Longevity depends on the specific combination of inks and
paper. For maximum life, the paper substrate will be "woodfree" (i.e.
wood-based but without lignin), or cotton-based, or a combination of the two.
Plastic substrates also exist.
No official paper industry definition exists for glossy, semi-matte,
etcetera, although an objective scale is available for the glossiness of papers
used in offset litho printing. Such paper suppliers as Epson
and Kodak all use their own terms to describe their paper, such as Everyday
(HP), Premium High Gloss and Luster (Epson) and Ultima (Kodak). ECI has categorized papers for proofing simulation of litho papers
https://twitter.com/shyesion
https://www.youtube.com/user/shyesion
https://cn.linkedin.com/in/yesion
没有评论:
发表评论