This effect was generated in Filter Forge, a Photoshop plugin that allows you to create your own filters.
V5: This filter provides manual adjustment of the three RGB filtration channels to produce B&W conversion of color images with four channel modes, full tone, and softness control. It was specifically developed to achieve optimal tonal depth in color to B&W conversion. Click and scroll "Comments" in library to see examples. Enjoy :)
HOW TO USE: To achieve optimum tone depth and detail in conversion, adjust the RGB filter shifts with each "Filter Mode" while comparing to the original image.
BW B&W Black_and_white Black_&_White Channel Contrast Convert Conversion Correct Desaturate Greyscale Photo Photography Soft Soften Softness Tone