[argyllcms] Re: {Spam?} ColorMunki drift test
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Mon, 06 Jan 2014 16:41:57 +1100
BC Rider wrote:
> I've attached screen shots of the L values graphed in Excel. There doesn't
> seem to be
> any particular drift and the variance is about +/- 0.1 dE2000 (which
> obviously includes
> the variance in the paper).
Hi,
This would seem to be very good for a strip read consistency. The Munki is a
bit more
repeatable than the i1pro due to the LED being a more repeatable light source,
but variation due to paper texture is typically of the order of 0.1 DE.
[ Note the i1pro has better low level repeatability due to electrical
sensor noise interference in the Munki. ]
If you look at <http://www.argyllcms.com/doc/i1proDriver.html>
then I got repeatability of the order of 0.01 DE for the i1pro under very
carefully
controlled conditions, which included not moving the instrument so as to
eliminate
paper and patch variation, as well as using longer spot reading mode. As soon
as the instrument is moved the repeatability typically drops to 0.1 DE or worse,
depending on the media and the printer.
> Also FWIW, I scanned using chartread -T 0.2. There were no errors flagged.
> It would
> be interesting to know how this setting equates to allowable reading
> accuracy. I
> haven't a clue on that one.
That option was intended to let more variable media (such as cloth) work.
Graeme Gill.
Other related posts:
- » [argyllcms] Re: {Spam?} ColorMunki drift test - Graeme Gill
