Konica Minolta micropress release 6 Manual Do Utilizador

These are linearization curves that ensure a 1:1 

response between gray values requested in a job and 

halftone values printed. Used to correct halftone 

chrome. The graph shows an example of a typical 

response seen from a non-linearized imagesetter.
The curved line is the imagesetter’s response. The 

straight line is the desired 1:1 response. If a 50% tint 

is sent to the imagesetter, a 30% tint is produced on 

paper. To solve this problem, a linearization curve is 

loaded into the RIP that defines the screen percent-

age to create based on the screen percentage 

requested. In this example, the RIP would create a 

higher screen percentage (60-70%) which, when 

printed, produces a 50% screen on paper. Note: 

Con-

tinuous tone devices (Contone, Gray) are linearized using Gammatic. Since “Tone Curves” require a 
calibration curve to enable their use, “EnableToneCurves” is provided for Contone and Gray printers.

Tone Curves are “adjustment curves” that modify the output of a printer currently using a cal-

ibration set. Used with both halftone and contone printers. For example, if a monochrome 

printer using the “Linear Monochrome” calibration set produces dark output, apply the Tone 

Curve “Light+10%” to lighten output by 10%. Where it may seem effectively the same as 

modifying the calibration set, the power of Tone Curves is five-fold:

1 Available to all printer types.
2 Curve effect is the same, regardless of printer type.
3 Standard calibration sets (linearization curves) remain unaffected, providing a consis-

tent baseline from which to work.

4 Since the printer is already linearized using the calibration set, Tone Curve values are 

absolute, meaning a 5% increase in tone curve value will create a 5% decrease on 
paper.

5 Can be used with the ICC Profile Processor to provide color adjustment capability and 

color matching.

Using Tone Curves with Contone or Gray Printers: Contone and Gray printers are linear-

ized by Gammatic and do not require a calibration set. However, since Tone Curves are only 

effective when a calibration set is loaded, a special calibration set called "EnableTone-

Curves" is loaded to enable Tone Curve use with these printers.
When to use Tone Curves: A Tone Curve modifies all jobs sent through the RIP. For half-

tone printers, this is the only method available for adjusting jobs. Contone or gray devices 

can use both Tone Curves and PSM ColorCurves. ColorCurves are applied to individual Pos-

tRipped jobs so they don't affect other jobs or jobs being sent through the system (see the 

PrintStation Manager Reference Manual). If you consistently use a particular ColorCurve for 

adjustment, consider creating its Tone Curve equivalent and load it into the RIP to be auto-

matically applied.