‘Alpha Mask’ is a black and white or grayscale image used to hide parts of an image without actually losing any information. It is used to place a background image. Photoshop alpha masking is a service that is designed for those people who take digital image editing professionally like photographers, image editors and graphic designers. We have the tools, techniques and excel manpower to do the job for you.
Learn more about Alpha Mask:
How masks are associated with alpha channels in Photoshop by Adobe
How to Create Alpha Channel Masks in Photoshop by Clipping Path Service
See also:
Free Online Alpha Mask Tools: