Activity 2: Use a transfer curve to control tonal response

Background

This feature allows users to manually create transfer curves by direct entry of Tint In and Tint Out values. It applies to transfer curves in the Print Curves tab.

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

Tasks

Goal

Create a 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, click the Add button .
3. .In the Device Conditions dialog box, enter the following values:
   1. From the Device Type list, select Any.
   2. In the Screening section, click the Edit button .
   3. Click the Add button  and enter 200L.
   4. From the Substrate drop down list, select Type 1 or 2 (coated art) 170 g/m2.
4. In the Curve Channels section, in the Process Inks list, select Separate channels for CMYK. 

5. 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

6. Click Apply.
   A print transfer curve is generated.  It is named 200L, Type 1 or 2 (coated art) 170 g/m2; Curve
7. Ensure that the Show in Prinergy check box is checked.

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 200L, Type 1 or 2 (coated art) 170 g/m2; 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 and confirm the vlues as well.)

Outcome

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