With the first image (PLUGE), the idea is to be able to see the lightest dark square (IRE 4), but not the darkest square.
The following set of images is used to measure red, green, and blue levels of grays and varrying intensities and to try to get them as close to the same as possible. You need some sort of color meter (the X-Rite Eye-One and Datacolor Spyder are covered in the guide) and software like ColorHCFR to measure the output. Again, see the guide for more details. I'm just providing IRE and PLUGE files hoping to save people time and money. Like the DVE DVD, the IRE corresponds to the k values (as in CMYK) of the color, not linear RGB values.
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