4-21
Chapter 4 Basic Operation
The general methods for calibrating a plate exposed with the PT-R are as follows:
• Perform linear calibration on the plate.
The dot area on the plate will not be exactly equal to that of the PostScript file.
When creating a linear plate with the PT-R, perform linear calibration (note that
there are some media types that do not require linear calibration).
• Perform calibration to make the plate match a conventional film-based
printed material.
Linear plates create an overall dot gain that is a few percentage points smaller
than plates created from linearly calibrated negative film. This is because linear
plates eliminate the dot gain created when the plate is made. Similarly, linear
plates print several percentage points thicker than positive plates.
• To match plates created with conventional positive or negative film to the PT-R,
reduce the deviation in highlights and shadows to zero.
This method is suited to the overall print characteristics of film-based printing,
and it offers excellent highlight and shadow reproduction.
• Calibrate so that the print characteristics of plate printing match standard
gain profiles such as those of proofs and SWOP.
This method is effective for standardizing and equalizing the tone reproduction
curves of different printing machines and paper; however, repeated calibrations
and corrections are necessary. When measuring the press sheet to adjust the
calibration curve, be sure to operate the printing machine using standard solid ink
densities and the optimum balance of ink and water.
Summary of Contents for PLATE RITE 4300
Page 10: ...x...
Page 11: ...Chapter 1 Ensuring Safety 1 This chapter gives information necessary for safe use of the PT R...
Page 26: ...PT R4300 USERS MANUAL 1 16 End of Chapter 1...
Page 38: ...PT R4300 USERS MANUAL 3 8 End of Chapter 3...
Page 39: ...This chapter explains the basic procedures for operating the PT R Chapter 4 Basic Operation 4...
Page 60: ...PT R4300 USERS MANUAL 4 22 End of Chapter 4...
Page 61: ...This chapter explains the procedures for setting PT R parameters Chapter 5 User Menu 5...
Page 122: ...PT R4300 USERS MANUAL 5 62 End of Chapter 5...
Page 157: ...This chapter explains this typical PT R problem and the solutions Chapter 8 Jamming 8...
Page 163: ...This chapter gives technical information on the PT R Chapter 9 Technical Information 9...