Tuning the Color Restruction Feature

This section describes how to tune the Color Restruction feature to control the color processing submodule of LTM within a DC9400.

Before you begin

Make sure:
  • The details view contains the Color Restruction table for LTM.

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

    Figure 1. Color Restruction Table for LTM

  • A VTunerServer is accessible.

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

About this task

This feature is used to tune the global tone adjustment submodule of LTM, which calculates the LTM gain from the input Y and Y_ltm images and applies the LTM gain to the input RGB image to generate the tone mapped RGB output image.

Procedure

  1. Next to Saturation Control Enable, select Enable or Disable to control whether to enable saturation control for LTM.
  2. In the Luma Threshold text box, enter the luma threshold.
    If the input luma is less than the threshold, then a certain LTM gain is applied.
  3. Next to Alpha Gain LUT, click View/Edit this Table and edit the alpha gain LUT in the prompted dialog.
    The alpha gain LUT contains 121 entries.
    You can use one of the following methods to update the alpha gain LUT:
    • Double-click and edit a single cell in the LUT.
    • Click Edit and update the LUT cells in the prompted Edit Table dialog.

      The cells must be specified in the same order as those in the LUT and separated by a comma (,) in each row.

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

      The order of the cells in the exported .csv file is the same as that in the LUT.

  4. Next to Alpha Luma LUT, click View/Edit this Table and edit the alpha luma LUT in the prompted dialog.
    The alpha luma LUT contains 129 entries.
    The methods of updating the alpha luma LUT are similar to those of updating the alpha gain LUT described in Step 3.
  5. Next to Saturation Control LUT, click View/Edit this Table and edit the saturation control LUT in the prompted dialog.
    The saturation control LUT contains 257 entries.
    The methods of updating the saturation control LUT are similar to those of updating the alpha gain LUT described in Step 3.

Results

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