High quality: Use PNG as image format.
Color depth: Higher color depth gives a broader range of distinct colors and a larger file size.
Shrink filesize: Optimize image files with lossless compression. This option will slow down the build speed.
Checked: Use a fixed filename for each image file. The filename only changes when the image is changed or the add-in options are changed. This is useful for synchronizing files to a web server.
Unchecked: Use numbered filename for image files, e.g. img1.png, img2.png, etc. The filename for an image may be changed when the Word document is changed.