Re: EyeOne min patch size in strip mode
Re: EyeOne min patch size in strip mode
- Subject: Re: EyeOne min patch size in strip mode
- From: Graeme Gill <email@hidden>
- Date: Wed, 02 Dec 2009 10:45:00 +1100
Terence Wyse wrote:
increased the value in .5mm increments. I found that it would "agree" to measure the
5x5mm patches but not reliably. I started getting reliable measurements around
5.5x5.5mm. I measured a relatively small chart (letter size or so) so I've no clue
whether it will measure this patch size reliably up to around 24".
Note that there is a difference between reliably recognizing the patches,
and getting accurate readings. The instruments have a finite aperture,
so this works as a convolution filter as you scan over the patches,
"fuzzying" up the boundaries and mixing the colors together as
it crosses each one. The instruments also have a finite sample
rate (and a signal to noise ratio that gets worse as you sample faster),
so the end result as you decrease the patch size is that you get
fewer and fewer samples for each patch, and a greater chance
of patch boundary samples being included in the reading, or
becoming a larger proportion of the reading.
Graeme Gill.
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