On another forum (Digital Black and White the Print - Yahoo). The members
recently discussed various glazing options. Here's my own summary of the
discussion:
To sum up then, we have good reason to believe:
1) Glazing is the translucent rigid substrate goes between the mat and the
front of the frame with traditionally framed photographs.
2) UV filtering glazing can significantly minimize the fading of a print,
with some types of prints receiving more of a benefit than others.
3) UV filtering is not the only display level variable that affects print
fading. For example, the overall light level and length of exposure is very
important with regard to image fading.
4) Each type of framing glazing has unique visual properties. For example,
regular glass has a green tint, and maximum UV filtering materials often
have a yellowish tint. Furthermore, anti-reflection coated substrates can
show color tints at various viewing angles, just like a multi-coated lens.
Which one looks best with your work is an aesthetic judgment best made by
visually comparing the options.
5) Anti-glare glazing has a texture that minimizes reflections but which
also lessens contrast and sharpness. Different brands have different
textures, with some having less negative traits than others. Some types have
a texture on both the front and the back.
6) Anti-Reflection glazing, as opposed to anti-glare glazing, does not have
a texture. Rather it minimizes reflections with coatings similar to those
on multi-coated camera lenses.
7) If a paper and mat have optical brighteners, the spectrum of light
hitting the print, a combination of the light source and glazing material,
will affect how effective the optical brighteners will be, and how long they
last.
8) Reflections on the framing glazing can hinder the viewing of the print.
9) Reflections are affected by lighting, light sources in the display area,
and type of glazing.
10) Some types of glazing are much more durable to surface defects and
easier to clean than others, with regular glass being easy to clean and
resistant to scratches, and the various plastics being more susceptible to
scratches.
11) Some types of glazing, such as acrylic, are much more resistant to
impact or shock damage, which is important when shipping for example, than
others.
12) Plastic glazing may change some of its properties over time, such as
becoming yellowed and more brittle. Different types and brands of plastic
glazing will have varying aging characteristics.
13) Plastic glazing weighs quite a bit less than glass.
14) The costs of glazing materials vary widely, with plain glass being the
cheapest, and anti-reflection coated/UV blocking acrylic being the most
expensive.
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