How to apply Cool and warm tone CIFilter in iOS?

问题

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.

回答1:

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")

回答2:

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.

来源：https://stackoverflow.com/questions/55177053/how-to-apply-cool-and-warm-tone-cifilter-in-ios