Add opacity to a color:

Set the pixel opacities in an image:

Add a constant white alpha channel to an RGB image:

Use an opacity of 0.5:

Specify the alpha channel using an image mask:

Specify the alpha channel using a grayscale image:

Specify the alpha channel using a color image:

Specify the alpha channel using a graphics object:

Add an alpha channel to a 3D image:

Add an alpha channel to a video:

Segment the background to be used as an alpha channel:

Set the alpha channel to a detected background:

Use an alpha channel to mask regions of an image:

Use an alpha channel to highlight a region of interest:

Binarize the image and delete border components:

Find individual cells that have only one hole and fill the hole:

Highlight the detected foreground while keeping the background half transparent:

Set the alpha channel of an RGB image to be the negative of its blue channel:

Color images are converted to grayscale when used as an alpha channel:

Use an alpha channel to focus on a region of interest in an image: