COMBINE
Keywords: greg

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COMBINE

            COMBINE

        This  task  makes  "combinations"  of  two input  images  to  produce  a
        third  one.   The  two input images may have the same dimensions, or the
        first one (Z one) may have less dimensions than the second (Y) one.   In
        the latter case, combinations will occur for all the extra planes of the
        Y image.  For example you can divide all planes of an input (Y) 3-D cube
        by  a  2-D (Z) image, provided each plane of the cube matches the single
        image...

        Operations are
                ADD             X = Ay*Y + Az*Z + C
                MULTIPLY        X = AY*Y * AZ*Z + C
                DIVIDE          X = AY*Y / AZ*Z + C
                OPTICAL_DEPTH   X = - LOG (AY*Y / AZ*Z + C)
        provided Y > TY and Z > TZ , TY and TZ being thersholds for the Y and  Z
        images.

        Image combinations may  also  be  done  using  the  SIC  arithmetic  ca-
        pabilities,   but   COMBINE  offers  the advantage of handling correctly
        blanking information.