Summary
In this chapter, we learned how to create different types of user interface to show images or 3D interfaces using OpenGL. We learned how to create sliders and buttons and draw in 3D. We learned some basic image processing filters as well.
In the next chapter, we will learn how to construct a complete photo tool application using all that we learned using the graphical user interface. We will also learn how to apply multiple filters to an input image.
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