Re: RPP raw photo processor 64
Re: RPP raw photo processor 64
- Subject: Re: RPP raw photo processor 64
- From: Robin Myers <email@hidden>
- Date: Sun, 02 Jun 2013 20:09:41 -0700
On Jun 2, 2013, at 6:44 PM, Graeme Gill wrote:
> Andrew Rodney wrote:
>
>> For the few photographers that want to go down the accuracy rabbit hole, who might be
>> attempting to use a camera system to make "exact copies" (if possible), go for it. The
>> rest of us have a goal of creating imagery as we want to represent it to a viewer.
>> That's part of the ART of Photography. For those who's use of photography is strictly
>> scientific, either to reproduce or capture without bias, the conversation is useful.
>> For the rest of us, it's a digression from making (or taking, there is a difference) a
>> photograph.
>
> I don't see how these goal conflict - in fact they would seem to complement
> each other. While technological limitations may force you to make artistic
> choices at the time of taking the photograph (and with film this was
> very much the case), the more faithfully you can capture the original
> light field, the better you are in a position to make the artistic
> decisions after the fact and at your leisure, or even re-interpret the
> same scene in several different ways.
>
> It's easy to throw accuracy away at any point, but hard to recover it
> again if it was never there in the first place.
I am in complete agreement with Mr. Gill. Perhaps a bit of history might focus things in this discussion.
When ColorSync was being created it was acknowledged that there are at least three common uses for images; high color accuracy reproduction, good accuracy reproduction, and pleasing reproduction.
These were encoded in the rendering intents absolute colorimetric, relative colorimetric and perceptual. The ICC chose to only represent two of these; relative colorimetric and perceptual. The absolute colorimetric case is derived from the relative colorimetric (ColorSync used a different method for the absolute colorimetric case).
For image capture, ICC profiling works very well for the relative colorimetric case, less so for the absolute colorimetric case; but it does not work well for the perceptual case because of all the exposure, pre-processing and other things previously mentioned in this thread. Adobe Camera Raw and the DNG format were developed specifically for the perceptual intent. They work very well for this case, but not so well for the colorimetric cases.
So it would seem that the original design decision to have a method to specify different image purposes was correct. It is only necessary now for the user to select the proper tool for the job and stop trying to use hammers to drive screws and screwdrivers to drive nails.
Oh, and before someone flames me for omitting the saturation rendering intent, in ColorSync it was a way to select a different method for processing out of gamut colors. However it has never been effectively used in the ICC world and often there is no user interface to select it. Which is really a shame because it had some interesting uses.
By the way, ColorSync celebrates its twentieth anniversary this year!
Robin Myers
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