The top chart shows the gray scale of the Runco plasma HD monitor relative to its color temperature at various levels of intensity, or brightness (20 IRE is dark gray; 95 IRE is bright white). As you can see, the gray scale as set by the factory measures within a few hundred degrees of the specified D6500 Kelvin. After making adjustments using the Photo Research PR-650, the gray scale measures within 150 degrees of D6500. The bottom chart shows the gray scale (or color temperature) relative to the color points of the display's red, green, and blue CRTs. The red and blue color points are reasonably close to those specified by SMPTE, which means the display should present most of those colors, or combinations of them, accurately. The green plasma color, however, is extremely green (less yellow) than that specified by SMPTE, thus affecting any image that includes green. The gray scale is only slightly cyan before calibration and is more accurate afterward. The gamma, not shown, is overly linear and should have a less-than-linear curve. This might make the image appear too dark in shadows but sufficiently bright with middle- and higher-intensity images. The light output was an extremely high 38 foot-lamberts measured off of a 15%-white window, which represents average picture material. A full-white image drops the light output to about 13 ft-L, indicating too little current from the power supply.—MW