Johann Knapp ( 1778 - 1833 ) was an Austrian painter. Johann Knapp s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 4000 USD for Three Floral Studies and a Study of a Duck and a Parrot in 2007 to 11706.15 USD for Flower Piece with Grapes set against a landscape in 2013 , based on the size and medium of the artwork.