I connected an image-node with a composite-node and connected a value-node into the alpha of the composite-node. I changed the values and the image changed its transparency.
Then, I connected the time-node into the alpha of the composite-node instead of the value-node, changed the graph of the time-node into an oscillating wave and when I clicked on different frames in the time-line the transparency also changed according to the curve.
So far so good, here the problem: My goal is to make an animation of a picture whose alpha-value is oscillating along with a curve through time. I tried to apply keyframes on the time-node but it does not seem to be possible.