This is a technique I use frequently.
To create the contrast in the color image above, I used a B/W conversion with Nik Silver Efex Pro which was layered as a luminosity blend layer.
Above is the original Photomatix Pro HDR image in Photoshop.
I ran the image through Nik Silver Effects to get a nice contrast between the leaves and the veins and blended it with the original color image.
Here is the resulting luminosity blend. In this case, I used the layer at full 100%. The blend layer is easily reduced to any density if needed.
The luminosity layer functions as a dodge and burn layer for the color layer. The tonal densities are superimposed over the color image. This method is sometimes referred to as a contrast mask.
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"IMAGINATION IS WHAT MAKES IMAGES UNIQUE"