Re: Colorimetric Accuracy in the Field
Re: Colorimetric Accuracy in the Field
- Subject: Re: Colorimetric Accuracy in the Field
- From: Ernst Dinkla <email@hidden>
- Date: Fri, 07 Jun 2013 14:36:33 +0200
On 06/07/2013 01:53 AM, Graeme Gill wrote:
So a "calibration" matrix can fudge it for a range of expected
object spectra x expected illuminant, but ultimately it's going to work
the best over the widest range of conditions if the camera spectral
sensitivity is closer to a human observer.
It would be interesting to know which current cameras best fulfil this ideal :-)
Such a camera would capture "what you see" with much less need for manual post
capture tweaking.
Graeme Gill.
Or the other way ... that camera could be one that can detect the
metamers with more filters than RGB and use software to create a human
observer condition instead of using RGB filters that match the human
observer. Sony used a more Cyan filter together with RGB filters on some
sensors. There have been more examples. White balance gets more accuracy
too.
An analogy is in the HP G4050 and G4010 scanners. Two CCFL lamps with
different spectral distributions, one scan run with each and adequate
software to represent the actual colors. Image Engineering tested the
G4050 against other desktop flatbeds and it performed better on acrylic
paint samples and inkjet print colorants than the other flatbeds did.
For photo dyes the accuracy was not better but that is to be expected as
most flatbeds are designed for scanning photos. I see a difference
between the old Epson 3200 and the newer V700 though, the first does a
better job with reflective scans (non-photo originals) than the last.
Sensor spectral differences I guess. It could be that the Epson 4990 and
V350 also in that test by Image Engineering behave alike.
--
Met vriendelijke groet, Ernst Dinkla
http://www.pigment-print.com/spectralplots/spectrumviz_1.htm
December 2012: 500+ inkjet media paper white spectral plots.
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