[argyllcms] Re: Conversion of spectral file to .cie

  • From: Elle Stone <ellestone@xxxxxxxxxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Mon, 17 Oct 2016 14:54:53 -0400

On 10/17/2016 09:48 AM, Dp Mailit wrote:

we are not talking about what is in the heart - you stated "Unless they
make their own camera input profile, Linux users and people using
free/libre raw processors perforce use the camera matrices in dcraw" = this
as noted is simply not true... they, as noted, can use, for example in case
of rawtherapee raw converter, dcp profiles from Adobe DNG converter
distribution built by Adobe (I am not saying that they are great, etc -
just they are available)... and those profiles (specifically for the latest
generations of cameras) are __NOT__ "matrices in dcraw".

The OP was interested in making an ICC profile, not a DCP profile.

Depending on one's editing goals, there are good reasons why sometimes people prefer ICC profiles over DCP profiles. See the links in Section F4 of this page: http://ninedegreesbelow.com/photography/linux-raw-processor-review.html#radiometric

If one does want to make a DCP profile, the first step is to make a matrix, just like the simple linear gamma matrices you can make using ArgyllCMS.

On 10/17/2016 10:01 AM, Dp Mailit wrote:
if "Wolfe" = "*Wolf* Faust" then those targets are too glossy for a "hoi
polloi" people to shoot properly... more matte ones like much maligned here
CC24 in its many incarnations/different formulations are much simpler (even
them being matte mean no very saturated patches)

Thanks! for catching my misspelling - looks like I've been misspelling Mr. Faust's name for years now. Sigh.

I'm not sure what your definition of "hoi polloi" might be. But making a target shot that avoids glare and uneven lighting even on a glossy target is relatively straightforward *if* you make a target shot outside using natural light. Some tips for using natural light to avoid glare and uneven lighting are given in Sections C5 and C6 of this page: http://ninedegreesbelow.com/photography/camera-profile-make-target-shot.html

Whatever kind of lighting you use, the target chart itself needs to be flat. I've been told that the older Wolf IT8 target charts can warp very quickly in direct sunlight on a very hot day, but the newer Wolf targets have a different backing just to avoid this problem.

Best,
Elle
--
http://ninedegreesbelow.com
Color management and free/libre photography

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