Re: new Canon printers
Re: new Canon printers
- Subject: Re: new Canon printers
- From: email@hidden
- Date: Wed, 7 May 2003 08:39:12 EDT
In a message dated 5/6/03 8:29:11 PM, email@hidden writes:
>
Now, now CD ! Over here our west facing test window gets glancing sun
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by late morning, and full sun for the remainder of the day, when there
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is sun of course! Short of having a rotating test site I don't think
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we could really do much better. Anyhow it's the comparison that is
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important here as I hope you would agree.
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I agree that its necessary these days to test your own combinations in window
tests, if UV exposure capability is important for your uses. While the number
of hours of direct sunlight in Britain can be depressingly low, the ratio of
UV to sunlight can be deceptively high, since there is a fair amount of UV
penetration at times when visible light is screened. So your tests may offer
different results than those from sunnier locations, but they will certainly
expose the prints to more UV than most anything else you could conveniently
do to them.
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I consider the Kodak RA4 paper to be the minimum standard for supply of
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display prints to clients. As a matter of interest, a test we carried
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out some time ago which started at the beginning of a hot UK summer, the
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Kodak sample was showing signs of fading at the end of 4 weeks, the
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Ilfochrome (Cibachrome) was looking poor after about 24 weeks and the
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emulsion was peeling off the support soon after, whereas the Fuji print
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went on for about 72 weeks before it was not good enough to display.
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Yes, I find that many of the longer lived gloss and luster inkjet media
will reach a point where the coatings are brittle and prone to crazing and
easy delamination by the time pigment inks reach significant fade levels in
window tests. UV seems the be the cause, as other testing methods don't get
this type of result. This occurs in about two months of local window time,
which would equal about a month in Arizona, or a year in Britain <G>.
C. David Tobie
Design Cooperative
email@hidden
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