troy_s

troy_s OP , 24 days ago

I say that sarcastically, as several folks have pointed this out prior. Note that I've approached this from the MacAdam moment side, which I suspect some of these folks cited were unaware of. After all, it's one of MacAdam's least cited works.

Yilmaz was the first to connect the idea of an "illuminant change" to a Lorentz boost, but the "origin" of this line of reasoning in the formal sense probably starts with Resnikoff, 1974.

troy_s OP , 1 month ago

Koenderink notes that Ostwald got the relationship fundamentally correct in one observation; as the total energy is down, we are left with low sensory relative luminance.

troy_s OP , 1 month ago

Sadly, Ostwald, following Koenderink's presentation, apparently got the idea of decremental energy wrong.

Anyone spot the logical error?

troy_s OP , 1 month ago

The logical error is in assuming that the total Ostwaldian "Black" is the carrier signal energy minus the maximal portion of the signal. This is incorrect.

If it were correct, the preceding diagram would somehow have zero Ostwaldian "Blackness"!

image/png

troy_s OP , 1 month ago

We can indeed correct Ostwald's vantage by simply focusing on what we as organisms are privy to in terms of the electrostatic signals we generate. Again, to recap, we generate a bipolar to retinal ganglion cell signal theorized as Luminance, or something similar to the sum of the Protan and Deutan cones, and Chrominance, which is two signals, one of which being the Protan and Deutan subtract Tritan, and the Protan subtract Deutan.

Interestingly, this holds for all signal activity.

troy_s OP , 1 month ago

The reason I die a little inside when I read folks like Ostwald who say "Blackness" and "Whiteness" is that it sort of betrays a far more deep cognitive construct of these ideas. The idea of a singular "white" or "black" is seductive, yet it doesn't take too much effort to realize that we can have simultaneous computations of both "white" and "black" relative to the global parametric gamut space.

The sloppy logic of colourimetry.

troy_s OP , 1 month ago

That is to say that following Ekroll's advice, we'd likely be wise to either ditch our use of "Black" and "White", and replace it with a more rigorously defined term, or we clearly define "Black" and "White" as something else.

Regardless, this plot is a rather elegant way of reconciling MacAdam's Moment calculation and Ostwald's framework of understanding.

troy_s OP , 1 month ago

To loop this general set of ideas to a more broad idea of a "carrier" signal, upon which the "amplitudes" could be considered excursions from the carrier signal, I want to reacquaint folks with the diagram I've done relating to the orthogonality of Chrominance and Luminance.

That's this diagram.

Again, this isn't really "my" work, but rather formulating MacAdam's in manners that follow from their work.

My sole contribution here is to frame the metric under Boynton's term Chrominance.

troy_s OP , 1 month ago

Under this framing, we can imagine the excursion from the carrier signal as defining a reasonably rigidly defined luminance to chrominance relationship under a "zero filtration" mindset.

That is, if we feed in a unit scalar energy across all of our visually sensitive range equally, the luminance projection follows this diagram in terms of Luminance and it's complementary Chrominance.

troy_s OP , 1 month ago

Note that if we think about the idea of "filtration" here as attenuating the global energy incoming, the parametric space of our plot changes fundamentally.

The "scale" of our luminance would shift, and as a result, so too our chrominance.

Interestingly... this plot still somehow holds up in all cases of filtration.

troy_s OP , 1 month ago

Given our equal energy per visible range slice case, we can reorient our vectorial Lagrangian-like diagram to draw what seems to be at least a plausible framing.

troy_s OP , 1 month ago

Note I just stuffed the old equilibrium line here at the "middle", but hopefully a reasonable person realizes that there's a pretty great bit of crap logic on my part.

It is entirely possible that the equilibrium is driven by luminance, or even Chrominance, unit area energy.

I tend to like the idea of the equilibrium being a Hamiltonian-Lagrangian though, as an emergent property emerges.

Anyone spot it?

What half has more luminous area in it?

troy_s OP , 1 month ago

That emergent property of a Hamiltonian-Lagrangian framing at least is intriguing.

Perhaps canonically outlined by Whittle, but more recently by:

Lu ZL, Sperling G. Black-white asymmetry in visual perception. Journal of Vision. 2012;12(10):8-8. doi:10.1167/12.10.8

troy_s OP , 1 month ago

MacAdam's work basically allows us to rephrase the Moment unit as a Chrominance vector.

This Chrominance vector is equal in force to the luminance vector, whose operation is orthogonal to Luminance.

We can restate MacAdam's Moments in terms of Luminance and Chrominance vectors, and also define them such that the Chrominance of a given signal is the equivalent of the complementary energy per unit area of Luminance.

Conversely, the Luminance is the complementary energy of Chrominance.

troy_s OP , 1 month ago

Ostwald’s “Black” and “White”, or perhaps Chrominance to Luminance, are describing orthogonally dimensioned excursions of the unit energy per unit area of a larger total signal.

troy_s OP , 1 month ago

Singh M, Anderson BL. Toward a perceptual theory of transparency. Psychological Review. 2002;109(3):492-519. doi:10.1037/0033-295X.109.3.492

troy_s OP , 1 month ago

I've quoted this passage to reframe the Metelli observation. How could equivalent luminance yield different cognitively assembled notions of "transparency"?

One possible line of reasoning could at least feasibly be the result of our cognitive allocations of luminance to chrominance. I say "cognitive allocations" because a single unit energy per unit area sample of stimuli provides us with nothing other than the contextual presentation we contemplate it in.

Segmentation becomes crucial.

troy_s OP , 3 months ago

Imagine the most simplistic articulation of energy fields where we showcase an “in plain view” shape, and another where we place a “coloured filter” of some sort between ourselves and the shape.

If we imagine holding up a ColorChecker 24 in each scenario, we can quickly realize that the way in which we segment the view is entirely akin to relative frames of reference.

We shall assume that our cognition has led to constructing a CC24 in two conditions, to look to decompositional mechanics.

troy_s OP , 3 months ago

This example uses the term “decomposition” (aka “scission” etc.) as a specific case of “segmentation along spatial depth”. Contrast against segmentation along the plane that is parallel to our projected field of view.

If we consider the two filter cases, the cognitive compass-like assignment of colour follows relativistic frames of reference.

troy_s OP , 3 months ago

As an example, I will use @tmw ’s example picture.

Here, the colour flows from the cognized configuration. If one gates toward a cognition of the “right side under a filter”, the “sphere” that is “behind” the larger sphere may be bound to a cognition of “pale blue”.

In terms of stimuli as presented, both the smaller “blue” sphere and the “without colour” sphere on the left are R=G=B.

troy_s OP , 3 months ago

@metin @tmw Vision is spatially and temporally variant. Every single saccadic motion and spatial frustum intake of energy can and will play a role in how we parse the sensory signals.

Frustum size is incredibly important here. After all, if you put your phone or monitor two kilometers away, I’m pretty sure you won’t “see” anything.

troy_s OP , 3 months ago

There is a very simple, and direct way to ensure that a culture is flexible and agile enough to address these toxic exploitation artists; do not license your work.

There is no license that can peer, like Nostradamus, into the future. As such, there’s no license that can predict how some nasty corporate entity can abuse some right gifted to it by way of a license.

Communities should be the final arbiter of trust, and trust is what is missing.

We need to return to a trust based culture.

troy_s OP , 3 months ago

@tmw It’s horrifying.

troy_s OP , 3 months ago

@tmw It’s brutal.

troy_s OP , 3 months ago

I just don’t have time for the petty little children any more. I don’t really care if you block me, or whatever. It doesn’t matter.

As I explained to Dmitry ages ago, after I have spent time trying to aid you in understanding, you don’t get to flex as “the expert” simply because you are a code monkey.

You can sit down and listen, as I don’t need to treat your momentary expert opinion on a subject that I literally explained to you a week before as valuable or even worthy of consideration.

troy_s , 4 months ago

@petrikas @pq Colorists and DITs employ a “bias light” that glows behind the display, in the field of view.

Without it, adjustments can get graded into the K-Hole very quickly, as a result of the incredibly complex gradient regulation and stitching.