Motor
shaftPrint- head
Quadrant
Printhead spring
Head raised : Print head bracket clear of sensor, arrowed. The quadrant is driven by a pinion on the print head stepper motor shaft.
Head lowered: Print head bracket activates sensor. Motor continues to drive a few more steps (see Printhead Position Adjust), compressing the spring to deliver
Color Calibration
Start > Printers (or Printers and Faxes) > Right click Zebra P640i > Properties > Device Settings > Color Calibration
Color rendering in the P640i can be described in terms of a curve, which determines how much power is put into the printhead for a given shade. The Y, M and C “color curves” can be separately modified by the Gain and Offset parameters shown here. Note: Typically, the set of values should be the same for each color. Click Restore Defaults if you are not satisfied with adjustments made.
Offset: Shifts the color curve up (darker) and down (lighter).
Gain: Adjusts steepness of the curve. Lighter shades will remain unchanged, but darker shades will get darker or lighter as the number is increased or decreased.
Prehea : Adjusts how much the head is preheated before each print line (every three hundredths of an inch). A larger value darkens (sharpens) the leading edges of colored areas. A lower value may result in “feathering” - starting light, then darkening over the following few pixels as the head heats up.
Black Panel Density, Black Panel Preheat: See K (Black) Panel Printing, above.
Contrast Adjust: A subtle color printing control, allows the user to shape the printer’s “lightness curve” (roughly speaking the “L” in the color space called L*a*b*). In practical terms this means the ability to control how the P640i resolves, or differentiates, the lighter and darker shades. Between contrast settings of 0 and 100, the lightness curve transitions from linear to sinusoidal. Linear (0%) tends to result in a low contrast, muddy looking image. Sinusoidal (100%) gives mostly good results, but tends to sacrifice the lightest and darkest shades. For most purposes, select 50% and leave it there.
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