The 1.0 version of Impressionist for Mac was provided as a free download on our website. Impressionist for Mac belongs to Audio & Video Tools.
From the developer:
The Impressionist Effect transforms iMovie into an impressionist painter and allows you to surround your animated paintings with any frame of your choice.
Impressionist gives an impressionist painting look to your clips. Impressionism is a style of painting born in France between 1870 and 1900. The principle of impressionism is that the painter renders the effects of light by the use of colors rather than details of form.
You may want to check out more software for Mac, such as Photo Effects #1 - Impressionist Paintings, Impressionistic Art Jigsaw Puzzle or Fine Arts - Impressionists, which might be similar to Impressionist.