AV News 197 - August 2014
To animate the object you need to add a second keyframe. There is a '+' button
which adds a new keyframe, half a second on from the existing keyframe. As
with all keyframes, this can be dragged along the timeline to a new position.
You will see in the next screenshot that I've dragged the new keyframe to the
end of the slide. This will be a copy of the previous keyframe, so if you were to
play the sequence you would still see no change for this slide. However, you
now need to make a change to the second keyframe. Make sure it is selected
by clicking on the box which shows its timing, which turns blue.
With the second keyframe selected, change the zoom at this point (either use
the up arrow keys, or type in a value into the Zoom box). Try 150, i.e. the image
will zoom to 150% of its original size. But why zoom in?
It could be I want to put some emphasis on the vehicle, in which case we need
to zoom into the vehicle, and not into the blank space in the middle of the
original image. To ensure that this does not happen, I've not only zoomed in,
but also panned the image so that the vehicle then ends up centrally in the
frame. So, I can change a single parameter between keyframes, but I can also
change several if appropriate.
Often 'zooming in' is not the most appropriate. 'Zooming out' on an image
allows the audience to see more of the image, it gives new information, in this
case the audience would see the vehicle and then a wider view of its
environment.
So, if I decided that was a better idea, do I have to start again? Of course not.
Keyframes can be dragged along the time line, so in this case, simply drag the
points to reverse them. Now you should see the image zoom out.
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