Working with EDL, ALE, and Cutlist Files Previous

Chapter 6, Browsing for Footage
Colour Decision List (CDL)

The American Society of Cinematographers Colour Decision List (ASC CDL) colour correction specification defines a common language format for primary colour correction. It is becoming a standard defined by the ASC and has been adopted by most major manufacturers.

CDL is expressed by nine numbers (three RGB triplets) representing predefined colour functions: offset, slope, and power. The format of CDL is standardized so results in one colour corrector can be duplicated in another corrector, so long as they both support the ASC CDL format. Currently, ASC CDL only supports primary colour correction, with the exception of chrominance (saturation change).

CDL Menu Top

The CDL menu allows you to:

To access the CDL menu:
  1. In the main menu, click Image.

  2. Click CDL.

    The CDL menu is displayed.

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Note: The CDL panel is not accessible from the ACS or the CP-100.


When you change the slope transfer function, it allows you to change the lift and gain of the image without shifting the black level that is established by the offset. The following is a graph displaying how the slope value affects your image.

The following are the values to set the slope:


The offset transfer function either raises or lowers the overall brightness of the component, while keeping the slope constant.

The following are the values to set the offset:


The power transfer function changes the intermediate shape and is the only non-linear function.

The following are the values to set the power:

Pre/Post Input LUT

You can decide to apply the CDL data either before (Pre) or after (Post) applying an Input LUT.

Note: Applying CDL data after applying an Input LUT will work only if the Input LUT is enabled within the Input LUT module.

CDL On/Off

The CDL On/Off toggle allows you to either enable or disable CDL data. Since the Bypass All function does not bypass both the Input LUT and CDL, you would use the CDL On/Off button to 'mute' the effect of the CDL.

CDL Parameter in the Selector Top

The Selector contains the following CDL parameters:

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You can use the Selector to:

Copying Parameters with the Selector

Lustre allows you to copy CDL parameters with the Selector in the same way as they would copy grading parameters. The parameters the Selector can copy are as follows:

Loading CDL Data in the EDL Panel Top

The EDL panel contains a new interface to support loading CDL data.

When you load an EDL into Lustre, the CDL data is not converted at that time. You can conform and assemble the EDL as you normally would do. However, if you want to use the CDL data part of the currently loaded EDL, you need to use the CDL Load options to apply the CDL data to the currently opened cut file.

CDL Load Options

When you are ready to use CDL data, you can select one of two actions listed in the CDL Load list:

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  1. CDL Load options

Note: Loading CDL data does not erase the current grade applied to the shots. Loading CDL data only loads the data into the CDL panel. If the CDL data is already loaded, it will be overwritten with the newly loaded CDL data.It is possible to use a different EDL to conform and a different EDL to import CDL data.

Assembling an EDL with CDL Data

The following procedure assembles an EDL with CDL data.

To assemble an EDL with CDL data:
  1. Drag the shots that you want to assemble into the Shot bin.

  2. Click Editing, and then click Assemble.

    The Assemble menu appears.

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    1. EDL list

  3. Select the EDL that contains the CDL data that you want to load from the EDL list.

  4. Click Load EDL.

    The selected EDL loads.

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    Note: For more information on assembling an EDL, see Assembling an EDL.

  5. Click Match Media to match the EDL event timecodes to the available shot timecodes in the Shot bin prior to assembling.

  6. Click Assemble to conform the EDL and build the cut.

    The EDL events in the Assembly window are cleared.

  7. Select the same EDL and click Load EDL.

  8. Click CDL Load All or CDL Load Selected. See CDL Load Options.

    The CDL data is now part of the current cut.

CDL EDL Comment

CDL data for a given shot is represented as a comment in the EDL file.

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There is one CDL comment line per event. See Adding CDL Data to an EDL File.


CDL data for a given shot is represented as a reference in the EDL file to an XML file.

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Note: The ASC CDL specification allows more than one colour correction data set per XML file. Lustre only supports a single colour correction data set per CDL and XML file. See ACS CDL specifications for more detail.

See Adding CDL Data to an EDL File.

CDL XML Files Location

To be able to use XML files, place them in an import sub-folder located in the project's sacc_data folder:

<my project>/<scene 1>/<sacc_data>/<import>