Drop a 2d Transform on what you want to check, reduce scale to 50% (or whatever you like), set to “Repeat Last” and scrub. Easy to tell if there’s even a pixel of black creeping in.
That’s a fantastic idea! So simple yet so effective. Thanks a ton for sharing.
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That’s such a good idea it should be feature available in the Viewport.!
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Glad you guys like it! Yeah, I think we’ve all been there at one point or another… Hope it saves you some eyestrain 
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Brilliant little trick, thank you!
Brilliant!!!