I have an animation in color, but there's a scene where I want it to flash from Black and White to In Color a few times.
How to do it?
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1 Answer
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In the compositor, you can add a Hue Saturation Value node:
Put the saturation down to zero to get a BW render, while 1 is the default value.
Press I while hovering the Saturation value to set a keyframe on it, and thus animate it.
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1$\begingroup$ Note : you could only keep one of the RGB channels, to convert to black and white, so that you have 3 different black and white, and so a little bit of variety and artistic choice. Not sure the best way to set that up in compositing. $\endgroup$Lutzi– Lutzi2025-12-10 10:33:44 +00:00Commented 17 hours ago
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$\begingroup$ Yes, like @Lutzi said, you can use single channels to get a black and white image by splitting them up with a Separate XYZ node. You don't have to use a single channel, if you mix, multiply or add them in different ratios to combine them in a single channel you have some artistic control over the look of the black and white image. Or with the solution in the answer, if just reducing the Saturation is not enough to your liking and you want to change things like contrast etc. you can either use a Brightness/Contrast node or a Color Ramp to finetune the black and white image. $\endgroup$Gordon Brinkmann– Gordon Brinkmann2025-12-10 11:23:51 +00:00Commented 16 hours ago
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$\begingroup$ And after creating the black and white image either with changing saturations and contrast etc. or by manipulating RGB channels, you can still easily animate this by just animating a single value: just use a Mix Color node where you plug the regular colored image into the first Color input and the result of the whole black and white nodes workflow into the second Color input. Now you can switch between those two images by changing/animating the mix factor from 0 to 1. $\endgroup$Gordon Brinkmann– Gordon Brinkmann2025-12-10 11:28:30 +00:00Commented 16 hours ago