Page 524 - ProShow Producer 9 Final Manual

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Keyframes and Layer Visibility

There’s one final important thing to note when you’re working with
keyframes, and this involves the very first and very last keyframes on your
slide.

Here’s a fundamental rule to remember: when there are no keyframes
present for a layer at a certain point in time, then that layer isn’t visible. In
essence, the layer might as well not exist.

For example, let’s say that Keyframe 1 doesn’t start at the beginning of the
slide. Instead, it starts at 2 seconds.

If you preview the slide, you’ll notice that you see only the background until
the 2 second point. At 2 seconds, the layer will suddenly appear, and then
go through whatever keyframes you have set up as normal.

This is also the case if you take your last keyframe and place it before the
end of the keyframe timeline. The layer will abruptly disappear.

This behavior is normal. This happens because when a layer has no
keyframes present for a point in time, Producer treats the layer as "not
being there". This is a valuable tool to you, because this gives you the
ability to decide when a layer is going to appear and disappear within a
slide, rather than being limited to just the slide time.

It’s this rule that lets you add and remove multiple layers within the same
slide, creating some great collages and image sequences.

When would you use something like this?

Imagine you want three images to appear side-by-side. You want the first
one to appear, followed by the second one 2 seconds later, followed by the
last one after another 2 second delay.