[argyllcms] Re: spotread filters
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 05 Jun 2008 14:20:30 +1000
Jacques Warnon wrote:
Sorry if I sound like newbie, becasue I am. I just searched through the
archives, but haven't found anything yet. I was curious about the -F tag in
spotread and/or chartread (-F extrafilterfile Apply extra filter
compensation file). How does it work, what does it do, and how do I go
about using it? Is it just a place to specify an .SP file? Spotread works
correctly with my eyeone so i know that is working.
It's intended to compensate for an extra filter in the optical path of
the instrument. I added it to calibrate a telescopic adapter that
I built for my Spectrolino. The lens in it is acrylic, so it filters
a fair bit at the blue end.
This is the result I get using one of the SP examples from the ref folder,
so I guess its not just an SP file:
D:\Argyll\spotread>spotread -c1 -F d50_0.0.sp
Setting filter compensation failed with error :'Unsupported function' (No
device error)
Yes, I don't think I've bothered to add that facility to the i1pro driver.
In some ways it's more straightforward because the XYZ is always computed
from the spectral, but the High Res mode will complicate things.
Creating a suitable compensation filter is a rather manual process though.
Graeme Gill.
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