Reverse text when partially over a dark object

[Poulpanzer]

I've tried and search. Is it possible to do this in affinity publisher. If so, how?

https://www.linkedin.com/learning/indesign-secrets/272-reverse-text-when-partially-over-a-dark-object

[GarryP]

Welcome to the forums.
Depending on what you want, you might be able to get away with using the Contrast Negate Blend Mode on the text layer (see attached GIF).

[Joachim_L]

@GarryP First thought = cool. Second thought = Seems to be more a gimmick.

Try this again in CMYK.

Edit: Even with CMYK you can get it to work. You just have to edit the font colour. Negative side effect: To get the part of the font inside the image pure-white you have to change the font colour to C100M100Y100K100. Which printing service wants to print this?

[GarryP]

I don’t use CMYK myself, as I don’t get anything professionally printed, but that’s a good point and something people should check before using this. Also, I have no idea how well this works on being exported to the various formats, so that needs checking too.

[Move Along People]

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[Joachim_L]

Nice idea, but I get a small area "bleeding" into the white. Black and white are positioned at 50%. All other values would create a black-to-white gradient. See image.

But I doubt anyone will see this.

[Move Along People]

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[lacerto]

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[JimmyJack]

I don't know Indesign, but some of the op's tutorial example seems un-needed. 
You can do it in AD in much the same way. One step shorter in fact. 

But why not keep it as simple as possible? 
Use the text itself (no duplicates required) to clip whatever color, image, texture etc you want inside it. 

[lacerto]

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[MikeW]

1 hour ago, Lagarto said:

In deed, but (K100 black) text color reversed at some point?

I'm unsure what you're asking, but I've used the lock children like in the above...

Both the text and rectangle are 100% black.