How to use special effects to show texture?

OpenGL OpenGL: Basic Coding
1

I wish to use fade in and fade out effects to show a picture.
How could I realize this special effects?

Any help would be much appricated,

Thanks

2

You can easily use a textured quad, displayed with a shader program.
You just have to implement the fade effect in your fragment shader, and send time via an uniform.

3

Can you give me more detail about it?
A simple example is more appreciated.
Thanks~