by selecting simple edit, all settings are applied for the duration of your clip.
this means that you'll have only one keyframe at the first frame of your clip. if you want to change settings at different frames of the clip, you'll have to clear simple edit. when simple edit is selected, the only toolbar button available is apply default settings.
. keyer controls
- auto key click this button to key on the most common color at the current frame (except gray). selecting auto key affects values for hue, saturation, luminance, and aperture. if your clip consists of a uniform key color that is evenly lighted, auto key will usually give you a good-quality chroma key. you can also use the a keyboard shortcut to select auto key.
you can use the following controls to customize your chroma key effect:
tip to see the color selector, you'll need to change the view to plot or map. for more information on the different views, see "viewing and selecting your key colors" on page 92.- hue use this to rotate the color selector around the perimeter of the color spectrum so that you can select different hues (colors) on which to key.
- saturation use this to select colors that have a particular saturation value. pale colors have a low saturation value and are located at or near the center of the spectrum. vivid colors have a high saturation value and are located at or near the perimeter of the spectrum. because pale colors have low saturation, you'll find them more difficult to key on than the vivid colors.
- luminance use this to select the colors that have a particular luminance value. a luminance selector in the luma plot (plot view) or luma map (map view) indicates the particular luminance value you??ve selected.
- aperture use this to widen or narrow the aperture of the color selector to increase or decrease the range of colors on which you want to key.
. fine-tune keyer controls use the following controls to fine-tune your chroma key effect:
- softness use this to soften the edges of your key by blending parts of your foreground image with your underlying image. this makes certain areas of your foreground image partially transparent instead of completely transparent or opaque.
- spill removal use this to remove the contamination (spill) that your key color may leave on or around the edges of your foreground image. spill is usually caused by light reflecting from your solid color backdrop (key color) onto your foreground image. spill removal replaces your key color from the "spill areas" with the opposite color in the spectrum, which returns a more natural look to these areas.
for example, after applying a chroma key effect to a foreground image of a newscaster against a blue backdrop, you may find that there??s a blue reflection in the newscaster's skin and hair. increasing the spill removal level removes the blue pixels by adding yellow to these areas.
- saturation threshold use this to proportionally increase or decrease the region outside of your saturation range. this controls how closely the saturation value specified under keyer controls must match the key color before a region becomes transparent.
for example, after applying a chroma key effect to a foreground image that includes dark areas or shadows that you want to preserve in your effect, you may find that these areas have become semi-transparent. by adjusting the saturation threshold, you can eliminate the key color from these dark areas, so that they'll become completely opaque.
- noise reduction use this to reduce the amount of noise in your clip. noise can be caused by imperfections in your key color which could produce slight differences in shading.