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Re: [OM] QP Card QP Color Correction Card (2 Cards) GQP201 - B&H Photo

Subject: Re: [OM] QP Card QP Color Correction Card (2 Cards) GQP201 - B&H Photo
From: Moose <olymoose@xxxxxxxxx>
Date: Mon, 18 Oct 2010 21:26:58 -0700
  On 10/18/2010 8:29 PM, C.H.Ling wrote:
> Question, how long does the IT8 target last (fading)?

I don't really know. The ones I have are on Kodak paper. I keep them in a cool, 
dark, dry place, and hope they will last 
a few more years, as they've only been in bright, direct light for a few 
minutes so far.

It would be easy enough to keep track. Scan them every so often and compare the 
results.

Wolf now offers a reflective 4x5" one on Fuji Crystal Archive, which I suppose 
will be better.

> What is the accuracy of the non individually measured IT8 target?

How is one to know? The only way I can see is to buy a bunch and measure them 
with an expensive piece of lab equipment.

Wolf's targets are the least expensive. As I understand it, they are printed in 
batches all at once, then samples are 
measured to create the correction file. I know that's accurate enough for me. I 
suspect it is accurate enough even for 
your more finely attuned color sense.

Moose
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