or tuning images by distributing light from a point source spectrally so that each pixel in the resulting two dimensional image corresponds one to one with the light having a specific wavelength application_number US 30965594 A description unless otherwise noted herein like components have like reference numerals throughout the drawings fig1 a and 1b illustrate a structural concept of a transmitter in a system for direct image transmission according to the present invention white light from a point source 1 is collimated by a lens 21 and the collimated light is inputted into a grating 11 to the vertical direction shown in fig1 a the incident angle of the collimated light onto the grating 11 is predetermined so that a diffracted beam of the first order of the above described collimated light from the grating 11 is focused by a cylindrical lens 31 disposed parallel and adjacent to the grating 11 the direction of the grating 11 may be either horizontal or vertical with respect to the optical axis and thus the diffracted beam is continuously and discretely distributed horizontal or vertical with respect to the optical axis according to the direction of the grating the distribution of the diffracted beam is such that the spectrum components of the point source 1 are disposed from the light having.