Pro edition has a powerful render engine. The render engine can handle more photos and larger canva than Home Edition. Pro edition allows you to load more photos to create a billboard size photo mosaic.
Pro Edition includes a photo edit toolkit, which allows you to batch edit the photos, select photo with different aspect ratio to different directorys, resize them, crop them, etc.
Another powerful tool is index color viewer.
Once you created your photo collection, you can use the index coloer viewer to scan that collection.
the viewer will tell you how many colors you have in this collection.
If you want use you photo collection to create a photomosaic, you can use color viewer to check if it covers the main image’s colors or not.