[argyllcms] Re: Poor Man's Colorimeter
- From: Ben Goren <ben@xxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 11 Jun 2015 08:58:07 -0700
On Jun 11, 2015, at 7:52 AM, Zi Wang <ziwang84@xxxxxxxxx> wrote:
I’m quite literally trying to calibrate a scanner so I can pretend it’s a
colorimeter because my samples do not have homogeneous surfaces that are
large enough for a proper spectrophotometer.
I doubt you're going to have much luck with a scanner for this
purpose...building a profile for a scanner that's good enough for that is going
to be an extreme challenge.
I'm hoping I'm closer to the end than the beginning of building a camera
profile that would suffice...and some of the gear I'm building for that should,
in theory, more than suffice. But it's still very much a work in progress.
A key piece is that it's possible to build a large, high-quality spectroscope
on a very small budget with the sorts of things you'd find at an arts and
crafts hobby store. My latest design iteration was close, but I didn't mount
the (cheap plastic film) diffraction grating very well, and there's more stray
light that I can eliminate.
I'll be using the spectroscope and some other similar low-budget high-quality
gear to build a camera profile that should be good enough for what you're
looking for. At least the early designs will still need a spectrometer (like an
i1 Pro) and a traditional chart to provide a calibration reference, though I'm
pretty sure even that much can be done away with...and that the same or a
similar hardware setup can probably be adapted for high-resolution
high-precision spectroscopy work. Again, just with a digital camera (that can
output RAW) and some cheap DIY craft-type equipment.
...but I'm still not quite there yet. If the gods smile on me, I'll have the
spectroscope done this weekend, maybe sooner...but I've still got a fair amount
of the rest of it to put together....
Cheers,
b&
Attachment:
signature.asc
Description: Message signed with OpenPGP using GPGMail
Other related posts:
