On 27/03/2018 17:04, Grant Taylor wrote:
> Are the filters you found physical that go over the lens?

I've got a UV IR Cut Filter 8mm Square X 1.1mm Thick (UVHM 080801-IRB3) 
from ebay, as it's a perfect size to for the gap in the camera mount 
that cam with the Pan Tilt hat, and I've now got it glued in to that 
with a dab of PVA adhesive.

If you get a different holder, check the size of the opening for the 
lens, and get a matching IR filter as they come in a variety of sizes. 
You may need to add a couple of nylon bolts as a stand off as some 
mounts look like lens protrudes slightly into the opening.

> I've also seen reference to software that can do some color correction. 
> -  I need to learn more about this.

With the IR filter you don't need any colour correction, but for 
existing images you can use the gimp's range to tools.

If you've got lots of stills and videos which need correcting (as I did 
when I discovered a couple of hundred I'd taken at Barcelona Winter test
had the wrong white balance set), once you've found the right correction
curves, Linux's ImageMagic and ffmeg command line tools can be used to 
batch process stills and video respectively. After using exiftrans to 
regenerate the thumbnails in the jpeg's you'd never known they'd been 
corrected.

The processing was pretty quick on an i7 laptop with 32MB RAM, I suspect
it would take quite a bit longer on Raspberry Pi 3 with 1MB, but still 
do able. I'll have to give it a try on some of my pre-filtered images 
and post the correction curves.

---druck

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