Re: Making SWOP TR001 compliant proofs
Re: Making SWOP TR001 compliant proofs
- Subject: Re: Making SWOP TR001 compliant proofs
- From: Ray Maxwell <email@hidden>
- Date: Thu, 25 May 2006 09:41:03 -0700
Roger Breton wrote:
I'm not going to chuck the Stantard Observers alltogether (how can I?) but I
remain skeptical and plan to conduct visual experiments of my own to prove
their validity. If my instruments says I have a match, I expect my eye to
confirm that match. If not then I'm in hot water.
Roger,
I fear you are in hot water...
With apologies to William...
"The fault, dear Roger, is not in our CMF's,
But in ourselves,"
Viewer metameterism...
I once had a ring around made with black ink only 50% tint background.
It contained squares within it made up of a constant cyan tint plus
horizontal variations of yellow and vertical variations of magenta. I
think that GATF makes a test pattern like this.
I was viewing this test pattern in a D50 light booth. Another friend
came down the hall and stopped to see what I was doing. I asked him to
pick the CMY square that matched the background in hue. He selected a
square. I said, "That is interesting, you picked the same square as I
did. We see eye to eye." He asked, "Why is that interesting?" I
pointed out that the spectrophotometer Lab measurements showed that the
square up one and to the right one was a better match. He replied, "The
instrument is wrong!" I then stopped two women that were walking down
the hall. I asked each to pick a matching square. One picked a square
up and left of the one the instrument showed as a match. The other
picked one up and left of the one chosen by the instrument. My friend
who had worked more than 30 years in the printing industry then said,
"You mean that a match varies with the observer?" He said, "This is an
epiphany."
Try it yourself.
Ray
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