If there is no vertical shift, they will also indicate x-intercepts. For example, suppose we want to graph the function \(y=cos θ.\) We know that the period is \(2π\), so we find the interval between key points as follows. 12 mai 2020 · Vertical Shift Brightness This was easy as I had already written an article on creating different Image filters cartooning, summer, winter, etc and it already included brightness function.