There are some confusion here. So to simplify
Profiles have much more information than just color space.The lighting of
the original subject (and surrounding) is very important for an input
profile. Unless you have specific input profiles for every lighting, it is
not so useful to have an input profile. And possibly it is also not the
intention of photograph.
Think about a sunset photo. You have warm (reddish) homes, yellow lights,
bluish lawn/fields. This is what do you see. But with a grey card
correction you will have an image with colors similar as you took the photo
at noon. An input profile is more powerful of the gray card (gamma, and
color specific correction are corrected), and IMHO it will ruin such photo:
it will get the real color of objects, not the colors as you see at sunset.
Input profiles are used with well known setup (product photography,
reproduction of arts), where colors should be correctly shown, but also
where you can invest much time on building your own input profile for such
precise setup. Note the various "color passports" (sheet with many colored
patched) are used to correct colors also on studio, but it is very far to
simulate/create a real input profile.
For normal workflows (also for most of professional photo) a program like
Darktable is important to adapt contrast, gamma, white balances, color
curves, etc. (which are a negation of input profiles).
ciao
cate
On Thu, Nov 13, 2014 at 10:34 AM, Rob Z. Smith <[email protected]> wrote:
> Nope, if the input image is a jpeg the 'input profile' if one was used at
> all would have been applied by the capture device/system so that has
> already been done for your jpeg and it is not needed except for raws.
> Specifically for dt an input profile isn't needed even for raws as we have
> colour matrices/base curves to do a simpler/faster version of the same job.
>
> Unless you have a really unusual requirement, just don't waste your time
> with input profiles.
>
> -----Original Message-----
> From: ternaryd [mailto:[email protected]]
> Sent: 12 November 2014 18:59
> To: [email protected]
> Subject: Re: [Darktable-users] Color management, LUT and swapped matrix
>
> On Wed, 12 Nov 2014 12:48:22 +0000
> "Rob Z. Smith" <[email protected]> wrote:
>
> > Input profile – corrects for non-linearities in your camera or other
> > source and is generally not needed
>
> Unless, the image is a JPG which was created using a particular and known
> color space. Right?
>
> Now, I'm guessing, that with raw images, having a default rule of base
> curves, just don't allow for input profiles, and applying one is simply
> nonsensical.
>
>
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