[argyllcms] Re: Limitations on Colormunki patch sizes?
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 14 Nov 2013 07:36:27 +1100
BC Rider wrote:
Hi,
thanks for your observations. The backing color is typically chosen on
the basis
of:
Following a standard - some standards dictate the backing.
Realism - if a document is likely to be one of many, then its backing
color will
be multiple sheets of the same media.
Practicality - to reduce the influence of printing from the other size
of the,
paper, a black backing is used.
Argyll has not slowed the Munki below 50 Hz - the point is that it is capable of
scanning far faster than this (and still does so in some modes), but accuracy
is reduced for reflective readings due to electrical interference between
the LED and the sensor. So it scans at about 50 Hz.
There may be some subtle differences between the X-Rite driver and the Argyll
driver results - this is to be expected, they are different code. Note that
due to the electrical interference problem I mentioned previously,
the dark readings do have a degree of inconsistency, and you really
need to average something like 20 readings to be able to draw
conclusions on fine differences near black. I've been comparing the Munki
results to that of the i1pro2, and have chosen to minimise errors in that
direction, rather than trying to slavishly emulate the X-Rite driver.
I think a larger study of a wider range of colors with comparison to
a more accurate instrument is needed before drawing conclusions about
the Argyll driver vs, the X-Rite driver.
Graeme Gill.
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