Feature request: smart invert where black and white are reversed but colors stay mostly the same.

[draperjames]

Hello, first thanks for your work developing and maintaining xcalib.

When I have to use Windows I use NegativeScreen to invert the colors. One feature that I really enjoy is smart invert which they describe as such:

Different inversion modes are provided, including “smart” modes, allowing blacks and whites inversion, while keeping colors (about) the sames.

The feature really shines when browsing the web. It looks closer towards a true universal dark theme than anything else I've seen. For example here is the duckduckgo homepage:

From a linux system if you look at the the same page after applying xcalib -invert -alter the logo appears to be more bluish and has a less native feel to it. This effect, of course, carries over to the rest of the web and whatever UI is in use.

I was wondering how difficult would it be to create either a smart invert function and/or an icc profile for xcalib?

The inversion matrices can be found here.

I'd appreciate hearing any thoughts you have on this subject.

Thanks again!

[beku]

I guess matrix handling is out of scope for xcalib. Xcalib works on single channel curves and is not crossing channels like matrices do.

However I keep this request open, as it might be possible to create a ICC effect profile for the desired effect and select that in Synnefo / Oyranos / CompICC.

[baongoc124]

@draperjames Smart inversion can be achieved using compton with method described in this repo https://github.com/vn971/linux-color-inversion . I'm not sure how it looks compared to NegativeScreen on Windows so could you try and give some thought?

[draperjames]

@baongoc124 thanks for the tip I'll look into it.

[beku]

Below are two taskbar screenshots. One comes with a CIE*L invert ICC effect profile, white point setting to ~3000Kelvin and the ICC VCGT calibration applied in CompICC. The other screenshot is shown without any color server effects.

[log69]

Hi, I'd more than welcome this feature as well, been looking all over the net for something like this. BTW great work for xcalib, thanks.

Wouldn't a simple RGB shift be possible? That could work like a 180 degree shift in hue (in HSL format). As simple as replacing values. I could offer money for this work. Would you be open to kindly look into the matter? Replacing values might need only small change in the code.

Thanks a lot.

[beku]

@log69 In a 1D calibration world, the one xcalib works in, it is not possible doing 3D changes on colors, like you want with a 180° HSL space manipulation. A 3D color transform is needed like available in compositors, which deploy 3D_Texture on GPU hardware.

[log69]

ok thx.