How to change minimum or maximum value by CIFilter in Core image?

Question

I\'m drawing several grayscale images in iOS. The values of grayscale image have minimum and maximum i.e. for 8 bit values in range [41,244].

I want to change minimu

Answer 1

For every effect in CIFilter we have minimum and maximum values . Either we can fix that value in code else if you want to fix ater drawing we done it by using UISlider for slider given minimum and maximum values as range of that filter then we can give action to that slider so when user moves effect also changes automatically.