Gray and colour

Hi community, i have a question.
I want my scene to look black and white, but i want some objects to have a bright colour, like blue or red. How do I achieve that?

The most straightforward approach would be through materials and textures. The surfaces of objects have their appearance defined by the material assigned to the object, and materials can have images (ie. “textures.”)

However this approach may not be flexible enough for your workflow, so another approach would be to texture everything normally, and then write a special screen shader that turns everything black and white. Code it to respond to a special tag in the scene, and objects with that tag get rendered normally (or tinted red or whatever.)

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