Managing Key Exposures
Before working with key exposures, it's important to understand how keyframes, exposure and key exposure work in Harmony:
|•||Keyframe: A keyframe is a point in time where a change to the properties of the object or character occurs. In Harmony, keyframes consist of the coordinates that determine how an entire layer and its contents are moved. Keyframes include these parameters: XYZ position, skew, scale, angle and pivot.|
|•||Exposure: Exposure is a property; it is the length of time that a drawing is visible over a series of frames. In Harmony, exposure is independent of keyframes. That is, keyframes are not linked to drawings. Keyframes can be moved independently from the drawing exposure.|
|•||Key Exposure: A key exposure in Harmony is a type of exposure that forces a drawing to remain exposed on a specific frame. If a drawing is exposed before a key exposure and you swap out that drawing for another one, then the original drawing is retained. This preserves the key drawing. Note that Harmony automatically sets a key exposure when you perform a drawing swap.|
Adding Key Exposures
Key exposures are mainly used for swapping drawings in cut-out animation where you will have numerous drawings for the various positions of the mouth or eyes of a character for example.
If there is a particular drawing you want to keep on a specific frame, you can set it as a key exposure. This prevents it from be overwritten by a drawing swap on a preceding frame. A key exposure is simply a property of an exposure that forces it to be exposed on a certain frame regardless of whether the previous exposure is the same drawing or not.
Example: Swapping a drawing with no key exposure
In the following example, drawing 3 (DR 3) is selected on the timeline and it contains no key exposure.
When it is swapped for drawing 4 (DR 4), the entire duration of drawing 3 substituted for drawing 4.
Example: Swapping a drawing with a key exposure
Here's what happens when swapping a drawing with a key exposure. In the following example, the playhead is positioned in the middle of drawing 5 (DR 5) to set the position for the new key exposure. When the new key exposure is added, drawing 5 is split in two; both halves contain drawing 5. Now if you swap the first drawing 5 for drawing 1, the second drawing 5 retains its exposure.
- In the Timeline view, select the drawing cell to set as the key exposure.
- Do one of the following:In the Timeline toolbar, click the Add Key Exposure button.
|‣||In the Timeline toolbar, click the Add Key Exposure button.|
|‣||Right-click and select Exposure > Add Key Exposure.|
A new key exposure is added.
If you added a key exposure at the beginning of the drawing, the entire exposure is filled with that same drawing. If you added a key exposure anywhere other than the beginning of the drawing, then the drawing is split in two and both parts contain the same drawing.
Removing Key Exposures
When you no know longer need a key exposure, you can remove it. When you do this, the existing key exposure is replaced by the preceding exposure. In the following example, a key exposure is set to drawing 1 (DR 1). When the key exposure is removed, the exposure is replaced by the preceding exposure, drawing 4 (DR 4).
- In the Timeline view, select a key exposure to remove.
- Do one of the following:
|‣||In the Timeline toolbar, click the Remove Key Exposure button.|
|‣||Right-click and select Exposure > Remove Key Exposure.|
The key exposure is removed and replaced by the preceding exposure.
When working with drawings to adjust the timing of a mouth in a lipsync, for example, and forcing the use of specific key exposures, unnecessary key exposures will be created. You can delete these duplicates without affecting the rest of the drawing. The first drawing of the selection will be used for the range.
- In the Timeline view, select the layer that contains duplicate key exposures.
- In the Timeline toolbar, click the Remove Duplicate Key Exposure button (you may have to customize the toolbar to display it).