Re: ColorMunki?
Re: ColorMunki?
- Subject: Re: ColorMunki?
- From: Graeme Gill <email@hidden>
- Date: Fri, 30 Jan 2009 13:58:40 +1100
Marco Ugolini wrote:
The ColorMunki wavelength range appears to be a bit more
limited than the i1pro, with a reflective mode range of 430 - 730
You say this based on direct observation/testing?
Direct observation of the calibration tables. The entries
for the wavelengths below 430 point to the same sensor
readings as those used for 430 (for reflective).
Observation of measured spectrum (ie. of the LED light
source) confirm this.
I don't have a ColorMunki myself, but if you do, could you please pass on to
me a copy of one of its CXF measurement files? I'd like to take a look.
Unfortunately the software doesn't run very well on my main system (a Windows 2K box).
Some of it works (monitor and print calibration), but some part of it gets into
trouble and it crashes (.net madness I think).
[The manual that came with the device claims that it will run on Win2K,
but then the installer software complains that it will not.]
I've looked at the CXF 2 spec., and (like a lot of XML based stuff),
it seems unreasonable complicated for what it is intended to do.
Is there only one LED light source in the ColorMunki, as far as you know?
Yes, there is a single LED. The plastic moulding has provision for
a gloss sensor opposite the LED, but it is empty.
I was able to look at a ColorMunki close up at MacWorld, and the opening
appears small enough to be able to read patches the size of those used for
the i1Pro.
Yes, I think the aperture is similar, but the packaging is a limit unless
some sort of guide ruler was to be used. A friend who has used it more
extensively to make profiles also reports that the two little rubber
pads that are meant to stabilise it when being used in its "one reading
at a time" mode tend to get worn away and fall off after some amount
of strip reading. The button is rather too easy to hit too, when you're
trying to rotate it.
Currently, it reads patches that are very large because it's meant to be
operated without a ruler by relatively inexperienced users.
Yep. It's neat the way its limitations make it suitable for its intended market.
But perhaps a ruler could be developed for it, which would make it possible
to fit many more patches on a page. This is, of course, if the ColorMunki
ever ends up being supported by higher-end profiling software.
I've no idea what X-Rite intend (or not) in terms of an SDK, but at a software level
the drivers are rather similar to the SDK (dll) that the i1pro uses.
[ I'm wondering too if the LED light source is a bit "bumpy" for high
quality reflective readings quite apart from the UV excluded
issue. The blue LED output has quite steep transitions, and they
occur right at the peak of our short cone response. It may be that
the readings are therefore unreasonably sensitive to subtle wavelength
shifts in the sensor, illuminant and sample at about those wavelengths.
Maybe there are more expensive white LEDs that are a little less bumpy,
but it also may be that you would have to get one custom built to make
a passable instrument illuminant, and of course this would be impractical
for an entry level device.]
Graeme Gill.
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