Oil paint effect without using any third library objective C

I’m new to IOS, I want to give an oil paint effect effect on image according to slider change in objective C

hi @pd_683,
There is a wonderful book by FlexMonkey, who has now joined Apple, https://itunes.apple.com/us/book/core-image-for-swift/id1073029980?mt=13

what you want to look at if you don’t want to use 3rd party libraries is CoreImage