M00001748
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ISO 18930 1st Edition, October 1, 2011 Imaging materials — Pictorial colour reflection prints — Methods for evaluating image stability under outdoor conditions
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Availability date: 07/13/2021
Description / Abstract:
This International Standard describes test equipment and test
procedures for determining the colour stability of photographic
colour images when subjected to outdoor conditions. It does not
specify limits of acceptability or failure criteria. Instead, it
provides means for measuring image changes that take place during
the aging of pictorial photographic images and indicates the
critical image-change parameters that should be reported. Users of
this International Standard should determine which test end-points
best simulate the intended display application.
This International Standard is applicable to pictorial images
made with digital printing media, for example:
— prints on coated papers, coated and uncoated clear and opaque
films, vinyl, polyester, synthetic papers and other plastic
substrates, laminated and not laminated;
— dye-based and pigment-based inkjet prints with aqueous,
solvent, phase-change, or UV curing inks;
— thermal dye and mass transfer;
— dye sublimation prints;
— digitally-printed dye-diffusion-transfer prints;
— liquid- and dry-toner xerographic prints;
— liquid toner electrostatic prints;
— digitally printed images made with traditional chromogenic and
silver dye-bleach photographic materials;
— colour direct thermal prints.
In these digital printing processes, the ink laydown is
controlled by means of digital pixel information, and all of the
settings and controls of the printing system can be documented and
repeated. In contrast, for many analogue printing systems, the
control over the ink film thickness can be subject to manual
adjustment. Window graphics on the outside of windows are covered
by this International Standard. Window graphics on the inside of
windows, for which sunlight is filtered by a layer of glass, will
be covered by ISO 18937.
This International Standard does not include test procedures for
physical stability of images, supports or binder materials.
However, it is recognized that in some instances physical
degradation such as support embrittlement, image layer cracking, or
delamination of an image layer from its support, rather than image
stability, will determine the useful life of a print material.
NOTE Image print stability results determined for one printer
model, ink set, printing mode, print resolution and media
combination are not applicable to image prints produced through
another printer model, ink set, printing mode, print resolution and
media combination, even if the ink jet cartridges and/or media used
in testing are the same.