An image processing apparatus includes a storage to store an original image, a processor to change a tone of a reduced image of the original image, a display to display a tone-changed reduced image, a connection determination unit to determine whether the image processing apparatus is connected to a network, a transmitter to transmit the original image to the server via the network together with data indicating a tone when the image processing apparatus is connected to the network, a controller to cause the processor to change the tone of the original image when the image processing apparatus is not connected to the network, and a receiver to receive the original image whose tone is changed by the server when the image processing apparatus is connected to the network.