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About superimposing and transparencySuperimposing describes the process of overlaying and combining multiple images. Video clips are completely opaque by default, but superimposing them requires transparency. When you make clips on upper video tracks transparent, they reveal clips on the tracks below. In Premiere Elements, you can quickly and easily make entire clips transparent by using the Opacity effect. In addition, you can apply any combination of opacity, masks, mattes, and keying to modify a file’s alpha channel, which defines the transparent areas in a clip. More advanced keying effects let you make specific colors or shapes transparent. Titles you create in Premiere Elements automatically include an alpha channel. You can also import files with predefined transparent areas. Applications such as Adobe After Effects, Adobe Photoshop, Adobe Photoshop Elements, and Adobe Illustrator® can save transparency. Not only will the file have an alpha channel, but it will also conform to your project settings. See the respective user guides for information on saving files with transparency. Premiere Elements uses the following transparency terms: Alpha channel A channel that defines transparent areas for a clip. This invisible channel exists in addition to the visible Red, Blue, and Green (RGB) color channels. Opacity A setting that determines how opaque or transparent a clip is. (For example, 75% opacity equals 25% transparency.) Lowering opacity of upper video clip (left) reveals lower video clip (center), combining the two images (right)Mask Sometimes used as another word for alpha channel; also describes the process of modifying an alpha channel. Separated Red, Green, and Blue color channels (left); the alpha channel or mask (center), and all channels viewed together (right)Matte A file or channel that defines the transparent areas of a clip. The matte determines the level of transparency in the resulting image. In Premiere Elements, you use mattes in conjunction with the Track Matte Key. Matte (left) defines transparent areas in upper clip (center), revealing lower clip (right)Keying Defining transparent areas with a particular color (color key) or brightness value (luminance key). Pixels matching the key become transparent. Keying is commonly used to replace a uniform background, such as a blue screen, with another image. (In TV, for example, blue screens behind weather reporters are replaced with weather maps.) The Videomerge effect uses keying to automatically define the primary background color as transparent. Replacing a background color with another imageA. Upper clip B. Blue Screen Key effect defines transparent areas C. Lower clip D. Combined clips Adjust opacityBy default, clips appear at full (100%) opacity, obscuring any clips on the tracks below. To reveal lower clips, simply specify an opacity value below 100%. At 0% opacity, a clip is completely transparent. If no clips are below a transparent clip, the movie’s black background becomes visible.
Keying out colorTo make specific areas in a clip transparent, apply a keying effect based on color, matte, or alpha channel. Pixels that match the specified key become transparent. Color‑based keying effects (Videomerge, Blue Screen Key, Chroma Key, Green Screen Key, and Non Red Key) Add transparency wherever a particular color occurs in a clip. For example, you can use color‑based keying effects to remove a background with a uniform color, such as a blue screen. Matte‑based keying effects (Four‑, Eight‑, and Sixteen‑Point Garbage Matte Keys, and Track Matte Key) Let you mask out areas of a clip with another clip or with areas you specify manually. You can add transparency according to the shape of a mask you position in the clip, or according to the grayscale tones in a file that you use as a matte. You can also use the Track Matte Key effect to make creative composites. Alpha channel‑based keying effect The Alpha Adjust Key effect lets you invert or turn off a clip’s alpha channel or convert areas without transparency to a mask. For more information about keying out colors, see Help. Create transparency with VideomergeTo automatically create transparency in the background of a clip, apply the Videomerge effect. This effect makes superimposing clips easy.
Create transparency with a keying effectTo create transparency wherever a specific color occurs in a clip, apply a color‑based keying effect. These effects are commonly used to remove a colored background.
Create transparency with the Track Matte Key effect
Hide unwanted objects with a garbage matteSometimes a color‑based keying effect properly removes a background, but undesired objects still appear, such as a microphone or cable. Use a garbage matte keying effect to mask out those objects. Garbage mattes work well for areas that have clearly defined boundaries but no uniform color to key. Garbage mattes also work well to clean up unwanted artifacts that a color‑based keying effect left behind. Unwanted background (left) is masked out by reshaping the Four‑Point Garbage Matte in the Monitor panel; then the Green Screen Key effect is applied (center) to superimpose the boy over the underlying track (right).
Invert or hide alpha channelsYou can use the Interpret Footage command to change how Premiere Elements interprets a clip’s alpha channel throughout a project. To ignore or invert the alpha channel of only a single instance of the clip, apply the Alpha Adjust keying effect instead.
How do I make the background of a video transparent?Go to cutout.pro and open Video Background Remover in its product list.. Upload the video or GIF that you want to make a transparent background.. Wait for it to process. ... . Choose Transparent in Change Background option.. Download the HD video when it finishes.. Open After Effects.. Can you remove the background of a video in Premiere Pro?Make sure you select the foreground clip. Then, in the Effects panel, search for Crop and double-click to apply the effect to your footage. In the Effect Controls panel, adjust the Left and Right values to crop out any unused area of the background. Step 3: Remove the background.
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