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Color Management/WorkFlow > Hardware and Software > Eye-One Pro Optimum Scanning Technique

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AuthorSubject: Eye-One Pro Optimum Scanning Technique   [Go to Bottom of Page]
John Hollenberg
Posted on Sun Sep 21, 2003 9:52 AM

After a lot of frustration scanning printed targets with Eye-One Pro, I have discovered a method which works well consistently for me. I am sharing it assuming that someone else has had similar problems.

1) Make sure the work surface is smooth and very clean, as surface irregularities
may cause the Eye-One to "bind" during scanning.
2) Put a piece of blank typing paper under the target to smooth over any existing
surface irregularities.
3) Create a narrow "window" of the row you want to scan and one row above and
below it by placing a piece of typing paper over most of the target (prevents
scuffing of the target by the plastic guide) and another piece above the target
(for the feet of the Eye-One to ride smoothly on).
4) Place the plastic guide on the target with the rollers on the typing paper,
and the scanning window aligned so that there is equal overlap of the guide
slot on each end of the row.
5) Place the Eye-One in the slot at the beginning of the row and hold the guide
firmly in place
6) Press the measure button and move the Eye-One SLOWLY and SMOOTHLY along the row.
Try to exert no downward pressure.

7) GM web site FAQ has this to say about scanning speed:

"If you scan in 5 seconds over 20 patches the Eye-One will average 8 spectral
measurements per patch."

"The optimal speed depends mainly on the patch size and the quality of the
printout. For the included scanner test chart, the optimal scan speed is to move
the device after the beep in 3 to 5 seconds over the strip. It is important to
scan in one continuous movement and not to stop in the middle of the strip."

7) CRITICAL STEP: scan the row in about 10 seconds (not 3-5 seconds as mentioned
by GM). This time applies to the 918 patch target. I found that this made a
HUGE difference in repeatability of the measurement. Once I switched to the
longer time, my average delta E between two separate measurements of the whole
target went from 1 to .1, the worst 10% average delta E from 3 to 0.5, and the
maximum delta E for the whole set from 5 to < 1. I assume that at this slower
speed there are many more measurements being averaged, plus you are less likely to
move the spectrophotometer so that it is reading the paper at an angle.

8) Footnote: using the data from GM above, the Eye-One is getting about 32 useable
measurements per second (they would have to throw away measurements which are in
the transition zone between patches). So, scanning a row of 27 patches at 3
seconds (for 918 patch target) would provide 3.5 measurements per patch. At 5
seconds it would be 6 measurements per patch. At 10 seconds it would be 12
measurements per patch.

I hope this description isn't too long-winded; this information would have saved
me many hours.

--John



... this thread contains expert advice from Andrew Rodney and Bruce Fraser.




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