You use the Add image filter link to create a new image filter. A new view appears:
Name of the image filter. Will appear as in "Image vault settings" under Image sizes.
A short description of the filter relevant to the editors. Optional.
If you tick this, the original size is retained regardless of the size you have specified below.
To specify a maximum width for the images.
To specify a maximum height for the images.
If you tick this, the height-width is retained regardless.
If you want to add an image filter where the images are a maximum of 400 pixels wide, enter Max width 400 and exaggerate the height to, for example, Max height 1000 and tick the Width-Height ratio box if you want the image proportional.
If you tick this option, you can browse for a transparent image that is placed on the rescaled image as a watermark.
The page published: 2019-01-02