may be merged to produce a single channel grayscale image by using a weighting scheme several u s patents disclose a suitable conversion process such as u s pat no 5 282 152 to caviasca u s pat no 6 101 272 to noguchi u s pat no 6 574 004 to jacob u s pat no 6 774 909 to nishio u s pat no 6 778 186 to mehigan and u s pat no 7 945 075 to lu the disclosures of which are incorporated herein by reference alternatively the multiple channels may be split i e separation of the r g and b channels or transformed e g transformation of rgb to hsv or rgb to hsl into a series of single component channels and may be processed separately and may later be recombined reverse transformed the input image 15 is split into two copies at the frequency separation step 17 into a first copy containing the high spatial frequencies and a second copy containing the low spatial frequencies using proprietary software and or using commercial software such as adobe u00ae photoshop u00ae alternatively the separation step can be performed as part of performing the bandpass filtering steps discussed hereinafter the copy containing the high spatial frequencies may be filtered using proprietary software and or commercial software in the detail band pass map 20 and may be controlled according to two required parameters and two other optional parameters as follows upper bound frequency required frequencies above this ceiling are dropped.