Using an exclusion mask

In Mosaic Tool, you can use an exclusion mask when applying color balancing to images in your mosaic. An exclusion masks is useful when the same feature appears radically different from image to image. You can use an exclusion mask to identify regions in the source images to exclude from color balancing. When you use an exclusion mask for color balancing, the image pixels within the mask region are excluded from the color-balancing computation.

A global exclusion mask applies to all images included in the mosaic project. A local exclusion mask applies to the selected or active image. In Mosaic Tool, exclusion masks display as vectors. You can create a new exclusion mask or import one to use during color balancing. On the Vector Editing toolbar, you can use the available vector-editing tools to modify the mask shape. You can also remove a mask or save a mask layer in your mosaic project.