Alpha Channel masking
In graphics, a portion of each pixel’s data that is reserved for transparency information. 32-bit graphics systems contain four channels — three 8-bit channels for red, green, and blue (RGB) and one 8-bit alpha channel. The alpha channel is really a mask — it specifies how the pixel’s colors should be merged with another pixel when the two are overlaid, one on top of the other.
Different parts of the object would have different levels of transparency depending on how much you wanted the background to show through. This allows you to create rectangular objects that appear as if they are irregular in shape — you define the rectangular edges as transparent so that the background shows through. This is especially important for animation, where the background changes from one frame to the next.
Clipping Path BD ensures 100% perfection Alpha channel image output. For best quality Photoshop Masking, manual Alpha Channel Masking can ensure very smooth edges of cutout or isolated images with Clipping Path BD who is much more advanced level of creating transparency ahead of clipping path.