Since the lines were so close to each other, the human eye easily blended the primary colours together to form the correct colour, much like an LCD display or television. For instance, a photo of a yellow flower would expose the emulsion beneath the red and green masks and not the blue mask. The developing process removed the exposed emulsion (under the red and green masks) and diffused the unexposed dye developer (under the blue mask) to its receiving layer, blocking light from coming through. This resulted in the projected light shining through the red and green masks but not the blue mask, creating the colour yellow.
