如何在iOS中应用冷色调和暖色调CIFilter？

Question

I am working on Video based Application in Swift iOS . Where I am using AVPlayer to play the Video and setting CIFilters on Video using AVVideoComposition . I have to apply Cool and warm tone filter effects on my Videos (please see the below images).

I have tried all the Core Image Filters mentioned in below Apple doc , but none of them looks like Cool and warm tone filter effect .

https://developer.apple.com/library/archive/documentation/GraphicsImaging/Reference/CoreImageFilterReference/index.html

Can anyone have worked on the same? Please suggest me.

Answer 1

It seems like the CITemperatureAndTint filter is what you are looking for. I frankly don't know exactly how the parameters work, but maybe you can check out this or this related question.

Answer 2

Thanks @Frank Schlegel for direct me to CITemperatureAndTint Filter with inputNeutral and inputTargetNeutral . Please see the below Core Image Filter Parameter to get Warm and Cold tone effect :

filter = CIFilter(name: "CITemperatureAndTint")!

//cold

filter.setValue(CIVector(x: 16000, y: 1000), forKey: "inputNeutral")
filter.setValue(CIVector(x: 1000, y: 500), forKey: "inputTargetNeutral")

//warm

filter.setValue(CIVector(x: 6500, y: 500), forKey: "inputNeutral")
filter.setValue(CIVector(x: 1000, y: 630), forKey: "inputTargetNeutral")