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Colors are real, The brain cannot 'magically' create something. I might say that color is an illusion of light, light has no colors, but the object has properties that when light reaches it, colors appear, so color exists out in the world only when there is light, but nothing to do with the brain creating it. Colors are completely independent of your brain to Its existence, but dependent of light.
That doesn’t mean color isn’t subjective.. it’s neither subjective or objective really, it’s relative. Relative to your biological hardware that evolved to see color. Such as your cone cells.. If you have more red cones than someone else, you’re going to be able to see more shades of red. If you’re lacking green cones, you’re not going to be able to see green. That’s how light works.. It strikes an object and reflects back the corresponding wave length. Infrared and UV light waves are not light waves that interact with an object’s color, rather other properties. Such as a flower petal having a surface that is able to reflect UV light. Your cone cells have actual pigment in them.. Red pigment in red cones, green in green cones, and blue pigment in blue cones. Each individual cone cell has countless pigments in it, each with varying degrees of concentration. So when you’re looking at some green grass, sunlight is hitting it and reflecting back a very specific wave length. The grass is green, but the light wave reflected back isn’t actually green in color (because waves has no colors), but it will only be able to pass through a specific concentration of green pigment in a green cone cell.. and when it passing through that, it sends the color to your eyes/retina/photoreceptors to the brain where is perceived.. If you don’t have any green cone cells, there will be no green pigment to allow the light wave that corresponds to green to pass through. So there is green color to grass, a colorless light wave reflected back that corresponds to green, and then green pigment in your cone cells that matches the light wave reflected back by the grass that sends the green color to your eyes, with the rest of the image. Color exists out in the world.. but how we perceive it is relative. Luckily for us, through our evolution we’ve developed full color vision. Although, your brain can really jack up the signals being interpreted.. such as synesthesia, or brain isn't creating, it is interpreting. Remember too that light energy can be separated via a prism and that's why there are colors through light.