Code reader and code reading method for color image

A code reading method for color images, characterized in that a:

• color imaging device is employed as an imaging element of a code reader;
• that a one-dimensional or two-dimensional code which contains identification information for specifying a subject for management, and color image data which contains the subject for management are inputted from the imaging device;
• that pixel data of R.G.B. Constituting the color image data is concurrently processed by respective signal processing circuits for luminance extraction and for color extraction, thereby to separate and extract luminance data (Y) in accordance with operation expressions, Y=R+2G+B and color data (r.g.b. data) in accordance with operation expressions, r=Y−2G−B, g+(Y−R−B)/2 and b=Y−2G−R;
• that the information expressed by the code is recognized on the basis of gray scale data formed of the luminance data of each pixel;
• and that said code and the original color image data of said subject for management can be recorded in mapping with each other.