Re: Archival image reproduction on Kodak Creo IQ3 scanner
Re: Archival image reproduction on Kodak Creo IQ3 scanner
- Subject: Re: Archival image reproduction on Kodak Creo IQ3 scanner
- From: Ernst Dinkla <email@hidden>
- Date: Mon, 25 Jul 2011 08:54:08 +0200
On 07/23/2011 05:05 PM, Robin Myers wrote:
When I made the measurements for ColorSage (Better Light's program using HP Artist), I selected as wide a range of colors as possible, with as wide a range of lightness as possible. As noted, having a wider sampling improves most color management profiling results and this one is no different. But it is not necessary to measure every possible blend of two pigments to get good sampling. For instance, in one painting it appeared that the artist had mixed a yellow pigment with a black pigment in a gradient between the two, so I sampled the yellow, the black and one blended color area between the two. It was not necessary to get every intervening mixture between the two blended colors.
In most artworks it actually becomes difficult to meet the 50 sample minimum requirement without repeating. With one painting of a cathedral at night, consisting of blends between only two basic colors, black and a yellow-orange, to get the 50 minimum measurements required sampling just about every possible mix between the two primary colors, with many measurements being repetitions.
Standard issues of measurement also apply. If the artwork has tiny areas and your spectrophotometer has a large measuring area, then the measurement will include the desired patch plus the surrounding colors, thus diluting the spectral result. Also, when using an i1Pro, or similar instrument, they must touch the artwork surface, so using these instruments is only possible on artworks such as dry oil or acrylic paintings where they will not be damaged by the contact. So if you want to measure pastels, pencil drawings, or other artworks with easily damaged surfaces, then you have to use a non-contact measuring device such as a Photo Research instrument.
If you want more information please feel free to contact me.
Robin Myers
Robin Myers Imaging
email@hidden
Robin,
Thank you, I have a better understanding of the system now. Next
question is of course whether a Canon sensor differs much on its RGB
filters that it could substitute a Nikon for the Ergosoft version of
this technology. Top Sony models are there identical to the Nikons
mentioned.
I see some analogy in the correction matrix (ccmxmake) for Argyll's
Dispcal screen calibration utility where spectrometer measurements are
used to correct/adapt a colorimeter for different monitor panel
colorants. The colorimeter still used for the calibration task as it
measures lower light levels better.
--
Met vriendelijke groeten, Ernst
Dinkla Gallery Canvas Wrap Actions
| Dinkla Grafische Techniek |
| www.pigment-print.com |
| ( unvollendet ) |
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