Instruction to Include custom LUT filter to allow quick inversion of content & window captures for quick use/visibility on the Lightboard:
NOTE: This filter will invert all greyscale (black to white, white to black) but leave colour alone (unlike typical "negative" image inversions and the stock LUT filter given in OBS)

1. Navigate to OBS Install directory: (typically C:\Program Files)\obs-studio\data\obs-plugins\obs-filters\LUTs
2. Copy & Paste "invert-LBD.png" into this folder
3. Open OBS Studio
4. Select Desired Source within OBS (ie: Window Capture, Image/Gallery, Media, etc.), and enter the "Filters" Menu for this Source.
5. Click the "+" In the bottom left of "Effect Filters" and add a "Apply LUT" filter to the source
6. In the "Apply LUT" filter settings, Select "Path" and select the "invert-LBD.png" as the filter

You're all set! This filter should invert White-to-Black, Black-to-White (with gradients) without inverting RGB colours of our original content itself

BONUS:
7. If you wish to invert your content colours as well if it is difficult to read after the filter, you may try the "invert.png" filter which inverts the entire colour channels of your content!
8. If you wish to clean up your image of excess menu-bars, artifacts or any remaining/unwanted features (such as scrollbars and window headers), you may additionally add a "Color Key" filter under "Effect Filters". You amy then select a colour by changing the "Key Color Type" setting to "Custom Color" (recommend WHITE, but any colour/shade can be picked) manually and adjust the "Similarily" (how close to the picked colour is removed) as well as "Smoothness" as desired.