Re: ProfileMaker 5
Re: ProfileMaker 5
- Subject: Re: ProfileMaker 5
- From: Graeme Gill <email@hidden>
- Date: Mon, 21 Aug 2006 16:57:07 +1000
Robin Myers wrote:
First, the illumination in the Spectrolino is a standard
tungsten-halogen bulb, thus very deficient in the blue and violet
spectral region.
While perfectly true that the blue and violet region of an
incandescent illuminant have far lower levels than the yellow
and red region, there is still enough U.V. to excite
noticeable FWA activity (just to forestall the assumption
by some that "very deficient" = "none").
> The D65 filter changes the ratio of blue light in the
illuminant, ostensibly to achieve a D65 simulated illuminant. My sources
at Gretag have stated that it does not really achieve a full D65
simulation, but it gets close to a D50 simulated illuminant. I have not
had the time to confirm this with my own measurements but it does sound
plausible.
I just had a go at measuring the filters effect using two different techniques,
and to say the least, I'm rather disappointed in the lack of resemblance of the
resulting spectrum to either D50 or D65 !
Graeme Gill.
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