A quick and easy alternative to getting the amazing Instagram filters on Mac is to use filters for photos found in the App Store. This is a free app.
This app gives you over 30 beautiful hi-resolution filters to choose and edit filter amounts and contrast. This app truly creates awesome beautiful transparency to any photo you have in a matter of seconds! Many of the filters are better than Instagram’s.
Quickly import and image, apply a filter, and export to file. Filters for Photos automatically creates a new image when you import and does not overwrite your original image.
Download Filters for Photos from the App Store here.