@class CIVector, CIColor; @interface CISmoothLinearGradient : CIFilter @property (retain, nonatomic) CIVector *inputPoint0; @property (retain, nonatomic) CIVector *inputPoint1; @property (retain, nonatomic) CIColor *inputColor0; @property (retain, nonatomic) CIColor *inputColor1; + (id)customAttributes; - (id)_kernel; - (id)outputImage; @end