YUCIRGBToneCurve filter not working as expected

[nikfil89]

I'm trying to reproduce some filters from Photoshop with YUCIRGBToneCurve filter.

As you can see with Photoshop and GPU Image effect is same but with Vivid is different.

Here is code for filter that I'm using:

let filter = CIFilter(
            name: "YUCIRGBToneCurve",
            withInputParameters:[
                "inputRedControlPoints": [CIVector(x: 0, y: 19.0 / 255.0),
                    CIVector(x: 30.0 / 255.0, y: 62.0 / 255.0),
                    CIVector(x: 82.0 / 255.0, y: 148.0 / 255.0),
                    CIVector(x: 128.0 / 255.0, y: 188.0 / 255.0),
                    CIVector(x: 145.0 / 255.0, y: 200.0 / 255.0),
                    CIVector(x: 255.0 / 255.0, y: 250.0 / 255.0)],

                "inputGreenControlPoints" : [CIVector(x: 0.0, y: 0.0),
                    CIVector(x: 48.0 / 255.0, y: 72.0 / 255.0),
                    CIVector(x: 115.0 / 255.0, y: 188.0 / 255.0),
                    CIVector(x: 160.0 / 255.0, y: 220.0 / 255.0),
                    CIVector(x: 233.0 / 255.0, y: 245.0 / 255.0),
                    CIVector(x: 255.0 / 255.0, y: 255.0 / 255.0)],

                "inputBlueControlPoints" : [CIVector(x: 0.0, y: 25.0 / 255.0),
                    CIVector(x: 35.0 / 255.0, y: 80.0 / 255.0),
                    CIVector(x: 106.0 / 255.0, y: 175.0 / 255.0),
                    CIVector(x: 151.0 / 255.0, y: 188.0 / 255.0),
                    CIVector(x: 215.0 / 255.0, y: 215.0 / 255.0),
                    CIVector(x: 240.0 / 255.0, y: 235.0 / 255.0),
                    CIVector(x: 255.0 / 255.0, y: 245.0 / 255.0)]
            ])

[YuAo]

Did you tried using kCIContextWorkingColorSpace key to specify a working color space when creating the CIContext object.

[nikfil89]

That was the problem. Thank you.

[imgyuri]

I know this issue is closed, but which colorspace should you specify it to? sRGB?