1. An image processing apparatus for generation of an outputting image by color-processing to convert a color image described in a control language for an output unit being used (hereinafter referred to as outputting control language) into color data adapted for said output unit, said image processing apparatus comprising: command image processing means for generating an image having color information by a pixel (hereinafter referred to as pixel image) by performing said color-processing on color data of a command image on the basis of color palette information given to the bits belonging to a region specified by the drawing command, said command image generated by drawing command.