Is it possible to make colors of text opposite of background?

[gianmarco2712]

I want to make an effect for text that makes text's color opposite of color, like this:

As you may probably see, the text is the opposite color of the background.
How can I achieve this effect?

 

[AaronD]

You might play with different settings of this (right-click the source), and different colors of the text to make the selected option do different things:

 

[gianmarco2712]

You might play with different settings of this (right-click the source), and different colors of the text to make the selected option do different things:
View attachment 99769

This does set it to the opposite color, but not the opposite color of the background, just the object's opposite color

 

[AaronD]

This does set it to the opposite color, but not the opposite color of the background, just the object's opposite color

There are 7 different options there, at least for me. And the entire range of colors to feed it. The text color in this case is no longer a color per se, but a modifier for the selected option to play with.

It makes more sense if you convert the visuals to math, play with the math, then convert the result back to visuals.

 

[upgradeQ]

Create scene_x; Add text source to scene_x. Do not change color, if it is not white, set it to white color #FFFFFF.
Create scene_y; Add background image. Add scene_x to scene_y. scene_x should be at the top of the in the sources list. Set scene_x "Blending Mode" - "Darken".
Create scene_z; Add background image. Add scene_y to scene_z. scene_y should be at the top of the in the sources list. Add an invert color shader as a filter to scene_y, use obs-shaderfilter plugin and this code as "User-defined shader".

float4 mainImage(VertData v_in) : TARGET
{
  float4 i = image.Sample(textureSampler, v_in.uv);
  i.rgb = 1 - i.rgb;
  return i;
}

P.S There are subtle graphical artefacts due to the way alpha blending works in OBS Studio 30.0.0, see this issue for details(not fixed).

 

[upgradeQ]

An update to the previous post, with the latest Advanced Masks plugin I found that you don't get graphic artifacts, i.e. if you add scene_y to scene_z it blends correctly and has no grey pixels when no shader effects are applied, basically you get the same image.

Create scene_x, add text/or other scene items masks, color does not matter.
Create scene_y, create a group inside scene_y, add your target source inside this group.
Apply the "Advanced Mask" filter to this group. Set the following settings : Mask Effect - Alpha Mask, Mask Type - Source, Source - scene_x, leave rest as default.
Then you can apply "User-defined shader" to this group.
Create scene_z, add scene_y, add your target source, you can use an existing one because the filter applied to it is set to the group scene item.