Flash-Tutorials - Onion Skin
Onion skin lets you view several frames. Clicking one of the three onion skin buttons you will bring up the onion skin markers located around the current frame. These markers set the frame range that is displayed when the Onion Skin is on. To change the marker position manually click on it and drag to the needed position in the timeline. To configure how Onion Skin markers are displayed you can use the Modify Onion Markers button. By default, the current frame is displayed in full colors while the other frames are semi-transparent. As you can see in the image, the objects are displayed as if they were drawn on the tracing paper and then placed one over another. Note how the opacity changes for frames that are further away from the selected frame. This important visual tip works for both Onion Skin and Onion Skin Outlines. You can edit only the selected frame but this is useful because you can see how the change affects the selected range of frames. Onion Skin feature plays great role in editing Frame-by-Frame animation as it lets you see each frame without switching between them.