The Watermark-Mask filter adds a mask image (with transparency) over the entire source image so that you can lay a professionally designed mask over all your images.
Settings
•Input the path to the image you want to use as a mask either by typing it directly in the edit-box or by pressing the Browse button and manually selecting the desired image
•Rotate mask for portrait images uses the same mask for both landscape and portrait images but rotates it 90 degrees for the portrait ones
•Use a different mask for portrait images gives you the option to add a custom mask for portrait images as well
•Alpha value is used to set the transparency of the mask images