HP 4050tn HP PCL/PJL reference (PCL 5 Color) - Technical Reference Manual - Page 275

No Adjustment This setting provides linearization only (that is, the user sees the device as a linear device). Process Blue This setting provides the same results as Vivid Graphics (linearization plus user-preferred enhancements) with the addition of mapping process blue, which looks slightly purple, to a blue closer to that of a standard monitor. This setting is not supported by HP Color LaserJet 5 and 5M printers. Vivid Graphics This setting adds color saturation to the resulting image. Transparency This setting uses a map to render the best color output on transmissive media. This setting is not supported by HP Color LaserJet 5 and 5M printers. Out of Gamut This setting prints colors in an image that are out of gamut-all colors that are in gamut snap to white, all out-of-gamut colors are snapped to the gamut surface. This setting only supports the device-independent color map. This setting is not supported by HP Color LaserJet 5 and 5M printers. CIE L*a*b* Match This map performs a true color match to the requested CIE L*a*b* input (there are no appearance matching adjustments). This setting only supports the device- independent color map. This setting is not supported by HP Color LaserJet 5 and 5M printers. Screen Match This setting produces a simulated Colorimetric RGB effect of device independent color to match the color to a Sony Trinitron monitor while operating out of a device dependent color space. This setting is supported only by HP Color LaserJet 5 and 5M printers. EN Modifying Output Color (Color LaserJet, 5, 5M, DeskJet) D-23