DICOM Image Viewer

Question

I am required to build a DICOM Image Viewer software in Windows Forms .NET Framework 4.5.2 and should be built explicitly for x86 architecture. I was told to build a panel consisting of buttons and PictureBox where the image should be displayed. The panel consists of File Open, Brightness, Contrast, Zoom, Reset, PAN, etc. buttons clicking upon which cursor edits the image. I am stuck at a point where I was told at some point say A in the image, brightness has been applied and I have to retain the value so that from that point contrast can be applied.

I want help in this regard provided that no trackbar can substitute a button.