[argyllcms] Re: A question about Spyder 3 + samsung 940Z5L laptop again
- From: "Richard Kirk" <dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender "richard" for DMARC)
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 25 Apr 2019 20:49:19 +0100
On 25 Apr 2019, at 16:59, Алексей Коробов (Redacted sender "koraalex" for
DMARC) <dmarc-noreply@xxxxxxxxxxxxx> wrote:
I'm not sure in, but Spyder is colorimeter, it measures RGB values, that
isn't enough to get out right colors out of source with non-standart spectral
channels.
It’s a bit more complicated than that. A colorimeter measured RGB values. There
are some colorimeters that measure 4 channels, with one for either peak of the
CIE X sensitivity. The Spyder has something like 8 channels -which puts it
somewhere between a spectrometer and a colorimeter. It ought to be better than
a colorimeter, but it appears it is not good enough.
A spectrometer is not expensive. If you have a cheap spectrometer, you can
calibrate it using an incandescent bulb as these have a smooth and predictable
spectrum. But a spectrometer is not sensitive because the light has to be split
into many more channels, so you will have to d=use something else to get the
whole of the tone curve. However, it ought to be able to measure the colour of
monitor primaries accurately. You could combine that with a tone curve
measurement using a colorimeter, or adjusting a neutral tone curve by eye. This
is what the Truelight software used to do (probably still does). The Truelight
projector probe had a spectrometer and a colorimeter. It’s not made any longer,
but if anyone wants to, we have a bunch of ideas for a much cheaper Mk II.
Cheers
Richard Kirk
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