In a message dated Wed, 25 May 2005 12:15:48, Mike Eddington wrote:
>> What's the expiring dates on Kodak Targets Kodak IT8.7/1 and Kodak
>> IT8.7/2 have an expiring date?
>>
>> I was wondering because I just received a new target (reflective)
>> which seems to be batched measured in 2000/6 and it's acting a litlle
>> bit weird.>
>
> They don't really have expiration dates as such, but the usable life of
> the target is a "function of its exposure to light, handling and the
> storage conditions used". Kodak recommends storing the targets (at least
> the transparent ones) in a light tight, air tight container in a
> temperature controlled environment...preferably a freezer (don't set the
> fish sticks on top of it). If you think the target has been compromised,
> you could have it remeasured. Anyone know how much it costs to get this
> done?
When using these reflective or transparency targets to profile scanners, I
personally don't trust that the specific individual target I have in my hand
reflects the actual values listed in the reference file.
Once, a few years back, I had an hour or so to burn, and perhaps was also a
more patient fellow than the passing of time has made me now. So I took a
4x5 transparent IT8 target and measured it (yes, patch by tiny patch!) using
Measure Tool in conjunction with the transparency function of Gretag
Macbeth's SpectroScan-T x/y table device.
(This is not for the faint of heart: you need a steady hand, no
distractions, and unwavering concentration, and I'm not kidding...)
I saved the measurements as a reference file, which I then used to create
the profile for the FlexTight Imacon scanner I was using at the time. The
results were quite good, so my hard work paid off in the end.
That solution, though, only makes sense if you already own the $5000-plus
SpectroScan T, or have access to one, like I used to. If you do not, a less
grueling route is to purchase one of Don Hutcheson's HutchColor HCT scanner
targets (<http://www.hutchcolor.com/hct.htm>), each of which comes with its
own certified individual measurements. They are available in 35mm,
medium-format, 4x5 and 5x7 sizes, and on a variety of film substrates (Kodak
Ektachrome, Fuji Velvia, etc.). Prices range from $150 to $490. I have not
used them myself, but I have read good reports from others.
--------------
Marco Ugolini
Mill Valley, CA
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