Analysis of some Working- and Output Profiles

[blackfoxx]

Ah, okay.

@afre

People have different opinions

And that’s good so!

@afre

Profile choice and colour space design also depends on your workflow

For sure. But the most it depends on output (format and purpose - print, presentation, webview…)
I believe this (and color management in general) is a barrel without ground. There will always be discussion and disagreement about this topic. And I know that there never will be a unified or universal solution which fits for everybody and every purpose…
My (personally) logic is this:
While working with RawTherapee I also use RawTherapee’s different profiles. I trust their developers and (imho) this combination should work very well together. If not, somebody should prove the opposite to me. End of story.
But where I have problems with trust is when individual people lecture over pages and pages about a “problem”, trying to prove something abstract while working with incorrect math and dubious sources. As I found in an old article here:

Feature request: save as floating-point

So the quantizing for the 212-point profile shown by Histogrammer is obviously a bad thing. The question is whether the quantizing is from Histogrammer not doing a linear interpolation between the profile TRC points (the ICC does specify to use linear interpolation between the points). We can’t check without access to the Histogrammer software source code. What happens to the histogram when you use cctiff (cctiff) to convert from my V4 sRGB profile to the 212-point profile? What happens to the…

@Elle

Elle:
I suppose my major motivation for bothering to make this post is that I’m rather tired of seeing dismissive terminology and arguments from unnamed authorities passing as valid ways to persuade someone that the person speaking knows exactly what they are talking about.
…
These are “appeals to expert authority”. However, appeals to little birdies and unnamed Wikipedia authors are not valid appeals to authority as the authorities in question aren’t actually named and no links are given to back up the appeal.
…
My statement that my ICC profiles have the same RGB XYZ values as Graham Gill’s ICC profiles is also an appeal to authority, as Graham Gill is a recognized authority on matters of ICC profiles. The difference in my appeal to authority is that anyone can go look at the ArgyllCMS website and download and examine the code and the profiles.

The only exception for me here is Elle Stone and Graeme W. Gill. Because their math and logic is correct and proved by many experts. Even I can retrace and confirm Elle’s theories and results.
As photography in general and digital photography in particular bases on pure math, there should always be a right OR wrong, true OR false and nothing (distorted) in between.

@afre

In this, there is no one true way

Of course there are many ways to go. But one certain way to one certain purpose should be true, from the beginning to the end.

Btw. The most that I’ve learned about RAW and it’s processing was written by Iliah Borg and Alex Tutubalin (Developers of LibRaw, RawDigger and FastRawViewer). If you would like to dig deeper in math and scientifical side of digital photography, you will find a bunch of articles by them scattered over the web…

Regards