luts Small Look-Up Table(s)

[AdamStanislav]

4 hours ago, jmwellborn said:

There should be room for your computer equipment -- just keep everything else in storage!!🙃 

Haha, looks like you know me well. 

[AdamStanislav]

Well, I still only have some of my computer equipment, so here is just a quickie, called SecondaryContrast.cube. It just increases the contrast of the secondary colors (cyan, magenta, yellow), while leaving the primary colors alone. Because our vision perceives the primary colors more strongly, this effect is quite subtle. But it is there.

[AdamStanislav]

54 minutes ago, AdamStanislav said:

It just increases the contrast of the secondary colors

Oops, I meant it decreases it, not increases.

[AdamStanislav]

And here is the one that increases the secondary color contrast, SecondaryContrastIncrease.cube.

[AdamStanislav]

Since it has been so long without my computer, of course I was just trying things, such as what would happen if I changed the contrast center of the black channel to a shade of blue and then increased that black contrast. The result surprised me, so I exported it to BlackBlue.cube and this is what it looks like,

The whole LUT leaves everything at the defaults, and only changes the green and blue components of the black channel into negative values (thus increasing the contrast of those components):

DOMAIN_MIN 0 0 0
DOMAIN_MAX 1 1 1
LUT_3D_SIZE 2
0 -0.2551195849 -0.5238095238
1 0 0
0 1 0
1 1 0
0 0 1
1 0 1
0 1 1
1 1 1

 

[MmmMaarten]

Some pretty cool... or well... warm ones in here! Great work! 👍 😀

[AdamStanislav]

20 hours ago, MmmMaarten said:

Great work!

Thanks.

[AdamStanislav]

Here is something I did before the fire, so I don’t actually remember what I did or why I did it (after the fire I had other things on my mind). But I saved it locally under the name Zelený Ryško, which is Slovak for Little Green Redhead.cube, so I probably started with the photo of some young redhead, a photo that probably did not do justice to his or her red hair. Anyway, looking at the source to this effect, I am assuming I selected a shade of green in that image, assigned it to the green color in a palette, then rotated all other colors (red, blue, cyan, magenta, yellow) based on that green, then gave everything the efficacy of -1, so the effect would be the exact opposite, and finally I reset the green color (and only the green color) to its default (i.e., rgb 0, 1, 0).

When applied to the image I have been using to show what all these LUTs do, the result looked like this:

Yes, kind of weird, but why not.

[AdamStanislav]

I watched a video today, in which someone pretended he was in the control room of a major TV studio by having a bunch of TV monitors in the background, each monitor showing something else, all of them being in black & white but with a blue tone, probably all emulated over a green screen.

And I thought it should be an easy effect to accomplish with a simple LUT to make whatever those monitors are displaying into that blue monochrome, so I made Blue Monitor.cube.

[AdamStanislav]

48 minutes ago, AdamStanislav said:

I made Blue Monitor.cube.

I should add that you can easily change the LUT to have the same effect but with a different color by simply editing it in a plain-text editor and saving under a new name (with the .cube extension).

Here is the original,

TITLE "Blue Monitor.sLut"
DOMAIN_MIN 0 0 0
DOMAIN_MAX 1 1 1
LUT_3D_SIZE 2
0.025 0.025 0.025
0.04622664613 0.3260622167 0.7400439226
0.04622664613 0.3260622167 0.7400439226
0.04622664613 0.3260622167 0.7400439226
0.04622664613 0.3260622167 0.7400439226
0.04622664613 0.3260622167 0.7400439226
0.04622664613 0.3260622167 0.7400439226
1 1 1

## Converted from "Blue Monitor.sLut" by sltconv, v.0.6.0

Note that the first line after the LUT_3D_SIZE line contains the red, green, and blue values of the black component. By default it is 0 0 0 but here it is 0.025 0.025 0.025. That lifts the blacks ever so slightly making the image slightly less contrasty. This is followed by six lines, all of them identical. They all contain the red, green, and blue values of the monochrome color. Finally, 1 1 1 is the white component, which makes image keep its maximum brightness.

All very simple. To change the monochrome color, you simply decide on its RGB values and replace the values in the six identical lines with them.