Create your own masks using your favourite image editing software. After creating your shape, you can import it into Memento Pro to apply to your images from the second drop-down under the Gradient & Masks tool.
Creating a mask
To create a mask in Photoshop or your favourite editing software, first create a project with a transparent background.
In this example, an 8x8" canvas will be used (300 dpi, sRGB).
Add a shape to fill as large an area as possible. Trim up the canvas size so that the shape fills it to its maximum capacity.
In this example, a heavy-weight font has been used to make the letter D, then the canvas has been trimmed so the shape fills the maximum area possible.
Important: the entire area of the mask is used to hold your image. As such, do not a lot of transparent area around your shape as |you will have much less flexibility to position your image within the mask.
In this example, images of identical dimensions are placed into the same mask, one trimmed to the edge and one not trimmed. The trimmed mask shows the maximum available area of the photo contained within it, whereas the untrimmed one loses a lot of the photo in the transparency area around the mask.
Any color may be used to create your mask. Reducing transparency on the mask will translate into reduced opacity of your image.
Adding your mask to Memento Pro
Save the mask as a .png file format. (A jpg format may also be used, but png is recommended for optimal compatibility.) In your file manager, go to Documents\Memento\Presets\Masks to automatically make the masks available in Memento Pro (a relaunch required to make them visible).
If you do not want to save your mask collection to this folder, you can import them into Memento Pro's Gradient & Mask tool via the Import Custom Mask button.
Clicking on this button will launch your file manager. Select one or more files to Open to complete the import.
Once imported, the masks will be available under the custom masks dropdown to apply to your photos.
Masks saved as jpg may also be imported. However, due to the lack of an alpha-channel in this format (transparency is not supported), you may need to adjust the alpha/rgb settings in the Mask options when applying it to an image frame.