Activity 2: Create a transfer curve to control tonal response

Background

This feature allows users to manually create transfer curves by directly entering Tint In and Tint Out values in the Transfer Curves section of the Print Curves tab.

This is useful when transitioning from another workflow and want to use legacy curve adjustments in ColorFlow.

Tasks

Goal

Create a CMYK transfer curve from a set of values.

Task 1: Create a Transfer curve by direct entry of Tint In and Tint Out 

1. In ColorFlow, click the Print Curves tab.
2. In the Transfer Curves section on the left-side panel, click the Add button .

3. In the Curve Name box at the top of the right panel, enter XX CMYK transfer curve (where XX= your initials).

4. Ensure that the Show in Prinergy check box is selected.
5. In the Device Condition section, leave all settings with the default values.
6. In the Curve Channels section, in the Process Inks list, select Separate channels for CMYK. 

7. In the Curve Definition section, perform these actions:

   1. In the Channel Selector, select Cyan.

   2. In the Curve Origin list, select Tint In/Out Points.
   3. Click the Tint Set  button.
   4. Click the Add button .
   5. Enter 10 25 50 75 90.

   6. Enter the following Tint Out values:

      Tint In	Tint Out
      10	8
      25	23
      50	47
      75	72
      90	87

   7. In the Channel Selector, select Magenta and enter the following Tint Out values:

      Tint In	Tint Out
      10	7
      25	22
      50	46
      75	71
      90	87

   8. In the Channel Selector, select Yellow and enter the following Tint Out values:

      Tint In	Tint Out
      10	7
      25	23
      50	47
      75	73
      90	88

   9. In the Channel Selector, select Black and enter the following Tint Out values:

      Tint In	Tint Out
      10	8
      25	23
      50	48
      75	72
      90	87

8. Click Apply.
   A CMYK print transfer curve is generated. It is named XX CMYK transfer curve.

Task 2: Output a page using the print transfer curve in Prinergy

1. In Prinergy, create a new job, and name it  XX Print Transfer (where XX = your initials).
2. Refine Chart_TintRamp_CMYK.pdf with 1stRef-Normz.
3. Output the PDF file using Virtual Proof.LoosePage with the print transfer curve you just created:
   
   1. In your Virtual Proof.LoosePage Process template dialog box, from the Output To list, choose Virtual Proof.
   2. Leave ColorFlow Color Relationship Management unchecked.
   3. Expand the Calibration & Screening panel.
   4. Select the ColorFlow Current State radio button.
   5. Expand the Print Curve drop down list and select curve XX CMYK transfer curve.
4. Open the generated page in VPS and measure the 50% patch for each color.
   Confirm that the print transfer curve has been applied and that the 50% patches measure CMYK 47 46 47 48. You can check other patches to confirm their values.

Outcome

 You have created a transfer curve to adjust tonal output to match target values from supplied data.