This question was posted in response to the following article: http://help.adobe.com/en_US/photoshop/cs/using/WSfd1234e1c4b69f30ea53e41001031ab64-7427a.h tml
If anyone is still looking for some visual reinforcement on this help topic, Andy Anderson has a Photoshop tutorial video on creating Droplets in CS6. He goes through different options in the Create Droplet dialog, finalizes the droplet settings, and then puts it to work:
Can you use Image Processor to control for color luminosity across multiple images? Essentially I have several color images and would like to keep them in color, but to have each image have roughly the same luminance value. How would I first indicate that I need to equalize luminance across all the images?