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By default, media added to your project is managed by Motion. If you delete a layer from
the Canvas or Layers list, the source media is removed from the Media list. You can turn
off this media management feature in the General pane of Motion Preferences. For more
information, see Media.
Duplicating Files
If you need more copies of an object in your project, use the Duplicate command or drag
a source media from the Media list to the Canvas or Timeline. Both methods create a new
instance of the source media. Another way to duplicate an object is to use the Make
Clone Layer command. For more information on the Make Clone Layer command, see
Making Clone Layers.
In a project with duplicated layers, you can adjust the attributes of all duplicates
simultaneously by adjusting the source media’s parameters. You do this by selecting the
source media in the Media list, then modifying its parameters in the Media Inspector.
These parameters define the source media’s essential properties, including frame rate,
pixel aspect ratio, interlacing, and alpha channel parameters. There are also parameters
that allow you to define source medias end condition, reversal, cropping, and timing.
For more information on Media parameters, see Source Media Parameters.
Seeing the Relationship Between Layers and Source Media
Two useful parameters let you see the relationship between image layers in the
composition and their source media in the Media list:
Media parameter: This image well in the Properties Inspector identifies the source media
of the selected layer in Layers list.
Linked Objects list: This list in the Media Inspector displays all image layers in the Layers
list that correspond to the source media selected in the Media list. Changing a layers
name in the Layers list updates the name that appears in the Linked Objects list.
Using the Reveal Source Media Command
A fast way to find a layers source media is to use the Reveal Source Media command.
To reveal a layers source media in the Media list
Do one of the following:
µ
Control-click a layer in the Canvas, Layers list, or Timeline, then choose Reveal Source
Media from the shortcut menu.
µ
Select a layer, then choose Object > Reveal Source Media (or press Shift-F).
The Media list opens, with the source media selected. The Media Inspector also opens,
displaying the source medias parameters.
210 Chapter 6 Creating and Managing Projects