Tuning the EOTF or OETF Feature

The procedure of tuning EOTF and that of tuning OETF are similar. This section takes EOTF as an example to describe how to tune the EOTF feature in the HDR pipeline of a DC9400.

Before you begin

Make sure:
  • The details view shows the settings of the EOTF feature.

    To tune this feature, you need to choose DC9400 > HDR > EOTF in the Features view. For more details, see Tuning a DC9400 Feature.

    Figure 1. Details View When EOTF under HDR Is Selected

  • A VTunerServer is accessible.

    For information about how to set up a connection to a VTunerServer, see Setting Up a Connection to a VTunerServer.

Procedure

  1. Select the Enable EOTF check box to enable the EOTF module in the HDR pipeline.
  2. From the EOTF Mode drop-down list, select one of the following options to specify the EOTF curve:
    • VS_DPU_EOTF_PQ: perceptual quantizer transfer defined in SMPTE ST 2084
    • VS_DPU_EOTF_DEGAMMA: programmable transfer
    • VS_DPU_EOTF_SRGB: standard RGB transfer
  3. If VS_DPU_EOTF_DEGAMMA is selected for EOTF Mode, enter the exponent in the Exponent spin box to custom the transfer.
  4. In the Segment Points table, use one of the following methods to specify the segment points for the six segments along the X-axis:
    • Double-click and edit a cell in the table to update a single segment point.
    • Click Edit and update the segment points in the prompted Edit Table dialog.

      The segment points must be specified in the same order as the table columns and separated by a comma (,).

    • Click Export to export the segment points to a .csv file, edit the file, and then import the updated segment points from the .csv file.

      The order of the segment points in the exported .csv file is the same as that in the table.

    The table excludes the first point and the last point, which are fixed to 0 and the maximum value, respectively.
    The difference between two consecutive segment points must be a power of two.
  5. In the Segment Steps table, specify the sampling point step in each segment.
    Each sampling point step must be a power of two.
    The methods of updating the Segment Steps table are similar to those of updating the Segment Points table described in Step 4.

Results

  • The tuning results are printed in the Console view in real time.
  • The image displayed on the VTunerServer side is updated.