An image processing apparatus obtains moving image data having a pixel array of a Bayer structure, transmits the obtained moving image data in accordance with a transmission method of transmitting image data having a pixel array different from the Bayer structure and auxiliary data indicating transparency of a plurality of pieces of color data included in the image data by using a plurality of channels, and controls image data of predetermined one of a plurality of colors where the number of pixels corresponding to the predetermined color is larger than that of other color of the plurality of colors, by using a channel for transmitting the auxiliary data.