Here’s my two cents –
It is basically a slide show, but think audio AND visual, not just visual. With the visuals, being stills, you can only do so much. Some examples:
– a sequence of stills can be broken up into 4 – 6 non-equal portions with 10-20 pixels of overlap in Photoshop, then manouever the pieces to form the whole in AE using 3D moves, substituting/dissolving the original whole into place at the last moment.
– pan and scan and rotate others
– variations of Card Wipe and other transitions, soft-edged or hard-edged.
– etc., etc., etc.
If the script/storyline can be segmented into groups, then you would use one type of effect/transition per segmented group to give it an organised look. The amateur would use all effects one after another without regard. The pro would organise and plan use of effects/transitions where necessary.
Remember a cut is also an effect. So is a dissolve. I know in film noir, a cut is to signify the same instance in time, and a dissolve a displacement/transition in time. But with stills, almost all stills are generally non-related in time (unless it is a sequence of animated stills), so dissolves and cuts are generally used almost exclusively to vary the pace of the show by reflecting the pace of the music and stir the emotions of the audience.
Long slow dissolves of 4 – 8 seconds duration are not uncommon. The outgoing still pix lingers and its luminance mixes with the incoming still, sometimes creating a beautiful holding transition that stirs the emotions. A bit tough with digital dissolves, but with voltage variations of slide projector lamps, this was something we lost going digital. I think some software use what is called an “additive dissolve” to simulate the same reaction of the two lamps. You could try the same playing with the Opacity ramp in AE…if you have the time and patience!
In some cases, don’t be afraid to hold the still for more than a second or two so that the audience can appreciate the beauty of that “captured moment in time”. When you view the sequence, you will instinctively know whether it is time to change picture or hold for a fraction longer. In this respect, the pace and beat of the music is important. So think AUDIO as well. It is half of the word “audiovisual”.
Generally, with audio, you are basically saying to the audience: “There is no voiceover here to tell the story, so the music is part of the story. Sit back and pay attention to this visualisation of the music.”
As for motion graphics, I’d advise that you put the storyboard/storyline sequences together first with all the stills, and sync that with the pacing of the music. Then as you review the sequences, you would be able to ‘see’ where sequences/introduction to sequences/end of sequences/transition between sequences can be improved with a motion graphic or two – lines, grids, starglows, text titles. etc.
Thomas Leong