. output this is the default view when you first display the custom chroma keys page. you can see the result of your chroma key effect in the preview window. you can click and drag in the preview window to select a rectangular area containing the colors on which you want to key. the tracking rectangle stays visible until you let go of the mouse button. the keyer controls are adjusted to reflect your selected key colors. you can also add to the previously selected key color by holding down the ctrl key and selecting a new rectangular area of a similar shade.
. plot click this to plot the colors and luminance values that are present in the current frame of your clip. the luma plot shows each luminance value present in your image as a vertical line in the histogram. a longer line indicates a higher amount of pixels in your image of that line??s luminance value. when you adjust the keyer controls, you can see the visual representation of your changes in the chroma plot or luma plot:
. map this view consists of a cube that contains a color spectrum, located under chroma map, and a luminance spectrum located under luma map. when you adjust the keyer controls, you can see the visual representation of your changes in the chroma map or luma map:
. matte this view displays the matte used to create your key effect. in the following example, you can see a white silhouette against black, with semi-transparent areas, such as soft edges, seen as grays. as explained for the output view, you can use the tracking rectangle in the matte window to select an area containing the colors on which you want to key.
tip you can switch to the matte view to further refine your key color. for example, in matte view, your key color (such as green) appears as black, and opaque areas appear as white. if you notice some white spots that you want to key, hold down the ctrl key as you draw the tracking rectangle over the white dots to add them to your key color. you can also adjust the keyer controls until the undesired white spots disappear.